The Periodic Table: Crash Course Chemistry #4

Hank gives us a tour of the most important table ever, including the life story of the obsessive man who championed it, Dmitri Mendeleev. The periodic table of elements is a concise, information-dense catalog of all of the different sorts of atoms in the universe, and it has a wealth of information to tell us if we can learn to read it.
Watch this video in Spanish on our Crash Course en Español channel! • La tabla periódica: Cr...
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/2SrDulJ
Table of Contents
Dmitri Mendeleev - 0:45
Mendeleev's Organization of the Periodic Table - 2:31
Relationships in the Periodic Table - 5:03
Why Mendeleev Stood Out from his Colleagues - 7:09
How the Periodic Table Could be Improved - 8:28
More info about the cylindrical periodic table of elements: www.av8n.com/physics/periodic-...
Crash Course is on Patreon! You can support us directly by signing up at / crashcourse
Want to find Crash Course elsewhere on the internet?
Facebook - / youtubecrashcourse
Twitter - / thecrashcourse
Instagram - / thecrashcourse
CC Kids: / crashcoursekids

[@crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ

[@sudeepjoseph69]

k

[@Inbbnbb]

Ok boss

[@rockellarose37]

THANK YOU

[@mysteryman4664]

A neutron walks into a shop and says,"I"d like a coke." The shopkeeper serves up the coke. "How much will that be?" asks the neutron. The shopkeeper replies, "For you? No charge."

[@Whatwasithinking28]

this is so underrated

[@SF-yz6em]

Good one

[@Karajorma]

The neutron says "Okay, I'll take it" The shopkeeper asks "Are you sure?" The neutron says "I'm not positive."

[@link_six]

JAJAJAJA

[@ahavakatz1421]

My new favorite joke.

[@elizabeth6134]

I actually love this comment section. It’s pure Au

[@juliancarlsonchanel]

My teacher threw sodium at me. Thats assaualt

[@catzar9511]

this is underrated

[@claironaut]

Thank you

[@taysim2343]

Did you pepper spray them?

[@kristinabraham7711]

*sodium chloride If he did throw sodium at you it would combust as it hit your skin due to the moisture that is on it😐

[@aviben-david7029]

Are you okay about what you’re teacher threw at you.What is a sodium, and when did you’re teacher throw a sodium at you.I think it must have hurt you.

[@Liv-ws2kk]

Can you imagine having as much confidence as Mendeleev? What an icon...

[@alexmccullough3707]

Looking at all the puns about helium like "HeHe"

[@AriasLittleWorld]

He13

[@ryanl.1085]

Haha (hafnium)

[@wysp5032]

@@ryanl.1085 NaBro

[@sarahazy]

Michael Jackson: HeHe

[@zhongliangcai602]

Tee Hee

[@josephstalin6549]

We worship you before our exams.

[@joshuadiniz684]

Joseph Stalin You sir, stole my words.

[@nycman6133]

+Joseph Stalin well since you r stalin can i be mussolini

[@nycman6133]

+Joseph Stalin well since you r stalin can i be mussolini

[@josephstalin6549]

nyc man If you pickle my nickle for a tickle.

[@josephstalin6549]

***** That is in fact the secret entrance to my secret bunker which leads to my secret office which is where I store my assortment of secret red pens which I use to write secret stuff which is secret for even the most secretive personnel which is a secret to the secret of secrets in the KGB which is a secretive organisation that is a secret to the country in the interests of national security which in turn is a secret country as countries are supposed to be secret and so forth

[@jannac1747]

i was going to tell you a chemistry joke, but i knew you'd have no reaction.

[@visionplant]

Are you sayin' I'm a noble gas?

[@consavvy5754]

Yeah, cause all the good ones argon.

[@verniellove891]

Con Savvy and the rest are all boron😊

[@chxnkimi]

Mm....am I a noble gas now?

[@noyonmoni396]

Guys I can't understand , can anyone please explain it...?? I saw it in many comment section but I can't understand😔😔😔

[@kartiktanguturi9677]

Chemistry jokes are sodium funny! I slapped my Neon that one.

[@royal_kim1154]

I C what you did there...XD

[@bristolhalle8463]

I'm scarred for life XD

[@user-qw6yd2rw2k]

thank you for this xD

[@vanessam157]

The periodic table is *quaking*

[@nidhi5810]

Knee on!!!! Took me some time to figure that one haha

[@gavinwarner3480]

You know, I was going to tell you a chemistry joke, but the only ones I have are Boron, and all the good ones Argon.

[@WomanSlayer69420]

LOOOOOOOOOOOOOOOOOOOOOOOL

[@gavinwarner3480]

***** Thank you.

[@pewnit]

lol, but I didn't get the boron part...

[@MakennaKramer33]

:):):):)

[@pewnit]

OOooooohhhhh, boron, as in boring... well, I got it

[@coolbeans5911]

two men walk into a bar. The first man says to the bartender: "I want H20", and the second man says: "I want H20 too." The second man dies.

[@sandervanders877]

+Carien Kotzé funny XD

[@samantha-tw3jl]

+Carien Kotzé pika! I love pikachu!!!!!!!!!!

[@chrisalexakis1844]

+Sammy Gaming cool

[@pikachan3405]

Pika?

[@samantha-tw3jl]

Pika chan pika da pikachu!

[@MrMask-lb1iq]

Chemistry Class Be Like Teacher: "Do you know the formula for sodium hypobromite?"Me: "NaBrO." Teacher: "What about the symbol for Nobellium?" Me: "No." Teacher: "Well do you at least know the symbol for sodium?" Me: "Na." Teacher: "... A+! :D"

[@mavisdom-animeonpiano]

Mr. Mask I LOVE THIS 😂😂👀

[@andrewdo5328]

Mr. Mask Lmao 😂😂⚛😂😂⚛⚛😂😂⚛⚛⚛⚛😂😂😂😂⚛⚛⚛😂😂😂⚛⚛⚛⚛

[@Benny-xy9vd]

😂😂😂 omg that's hilarious

[@mahafuzakhatun1489]

Loool

[@FadedOnSteam]

Nobellium Uranium

[@sea1sa124]

Au: You heard about Gallium and Yttrium? Ag: Nah what about em'? Au: They GaY

[@rosarichter4687]

This is new 💀👏🏻👏🏻

[@rabotlhokotlhabane9546]

You are right . My Mom scarified a lot for me .She passed away last year in September due to lung cancer ,but before she could die , I told her that I would like to be a Biochemist one day and she agreed(approved) my idea . I will not disappoint her .fFinally I managed to enroll with University Of South Africa this year . I am studying Bsc : Biochemistry and Microbiology part time ,but at this stage I am an Electronic Engineer ,I am changing the stream because I have always loved Biology and Chemistry . Thanks for your efforts Crush course team.

[@loganjmcquaid]

That's awesome man! Remember your mum when you're feeling down! Best of luck mate!

[@sawztaK]

Good luck!!

[@MopedOfJustice]

Rabotlhoko Tlhabane gg

[@Timothan]

Rabotlhoko Tlhabane I kinda want to say something racist and smart-arse-like, but I got nothing.

[@rabotlhokotlhabane9546]

Thanks cousins and Crash Course for your support .I managed to pass Chemistry .

[@petrifyer45]

Is nobody going to comment on how amazing Mendeleev's mother was?

[@queergeologist8207]

+Petrifyer She was easily one of the most dedicated mothers in history.

[@VarunSingh000]

+Hannah Glenn 1200 miles on horseback, 'nuff said.

[@317supersam]

+Petrifyer But... she abandoned her other children

[@VarunSingh000]

Samuel Jeon No, they grew up and went their own separate ways.

[@ClavinTheCat]

+Samuel Jeon what? are you not able to live w/o your mom?

[@Crazyboy48263]

the amount of nerdy jokes in the comments is amazing lol. I'm only here to better understand my chem course

[@lontongtepungroti2777]

yes

[@tejseth8027]

same

[@barbaracretty1675]

Scientist have discovered learning while laughing is supreme. I'm hungry

[@byronaustin8179]

Redfizz12 a year later and I actually need this video for my AP Chemistry class

[@limewarrircat4292]

A real science-nerd-lover needs this.Not for the school....

[@realgirl5055]

*Well, I heard that Oxygen and Magnesium are going out on a date and I was like........* *"O" "Mg"* 😮😮

[@prahachakraborty2237]

when i heard potassium was single, i was like K

[@nikozontini2945]

OMGGGGGGGGGGG

[@chunkymonkey2285]

This is one of the reasons I hate people on the internet.

[@geeway5923]

@@ratnakumarchaliyath7825 actually they have all the right to say this. why? *BECAUSE THIS IS AMERICA*

[@thedankside2552]

MgO*

[@dangelaflores6967]

the story of Mendellev's mother is heartwarming :). Now to memorize this damn table :O

[@crazysquirrel879]

Dee Flores look up the "asap science periodic table song" that (kind of) helped me memorized them

[@gabrivera6691]

I used the one using Cancan and sang it infront because our teacher told us to memorize the whole periodic table. Hahahaha

[@veenasahu]

Crazysquirrel I learnt it in 8 years old and now I'm Chem expert

[@andrewpoderis8548]

@@crazysquirrel879 thanks!

[@xflipsyx9878]

CrazySquirrel yep ^^

[@XZeroOneArmour]

nobody talks about the Horse here . without the heroic sacrifice of that horse we wud not have any P. table today

[@btsgot7ofexosjams29]

lolq

[@bstandsforbuilding5567]

We would, just not as soon.

[@fairytaleoverworlds7795]

Without that horse's sacrifice, most of us probably wouldn't have been born! because a chain reaction of events. Your dad in school would not study chemistry as it is, have a different homework assignment that day that would prevent him from spotting your mom at the bakery, and woosh. No you... That or a million other chain reactions.

[@prakh1250]

you...are right!

[@EtienneMammonGerard]

Chaos theory?

[@megangilmore9355]

I told a joke to the noble gases but they didn't respond :(

[@Brickerbrack]

They didn't *react*. But the joke nearly worked. ;)

[@neptunium-2374]

86.Radon and 118.Oganesson are‘Reactive’!

[@dottoking8696]

@@neptunium-2374 really?

[@dottoking8696]

@@neptunium-2374 radioactive ≠ reactive

[@reasatprottoy7488]

@@dottoking8696 We R L8

[@andresperalta4436]

Forget Aang or Korra, Mendelev is the real master of the elements. Those avatars only control compounds anyways

[@fireball65070]

But air is a mixture though 😂😂

[@Yzyenthusiast]

lol

[@Yzyenthusiast]

Earth is a mixture too

[@Yzyenthusiast]

fire is not matter

[@SethKhoury]

Air is a mixture, earth is a mixture, water is a compound, and fire is a reaction.

[@joshsamadder2748]

I was going to make a Sodium joke but Na

[@Naijiri.]

Someones a little salty...

[@FROPDESAI]

Poke Playah Stop being basic! BE SUPPORTIVE!

[@Naijiri.]

Lol, I was literally gonna make a Bromine Oxide joke after that, but, nah BrO.

[@ryuumi3083]

Poke Playah *cough* Br2O *cough*

[@FROPDESAI]

Ryuumi **insert THANK YOU.gif**

[@kainebulous1360]

I had a teacher named Mr. KOH, so normally we called him Potassium Hydroxide

[@kole1678]

I came to the comment section for the puns definitely not disappointed.

[@meganb1469]

Bob Ross oh hey bob

[@harneevkaurdhaliwal1723]

Happy little bob ross

[@bbyvcro]

bruh i thought you died

[@stormrider7235]

We watched this in Physical Science and no one understood why I was so happy. I was like, "Guys, it's frigging Hank Green!!!"

[@shoaib808]

People told me to be POSITIVE so I lost an electron...

[@chowtom5174]

Did they also tell you to never swim?

[@shoaib808]

+Chow Tom Not that I could remember... Why?

[@chowtom5174]

+shoaib lodhi when alkali metals which loses exactly one electron reacts with water they tend to do so explosively So you might wanna lost two electrons and be more positive while be less explosive :D

[@shoaib808]

+Chow Tom Haha.. Sure. I'm doing exactly that. Losing another Electron

[@jerrymiller2367]

Stay positive.

[@gabapentagram4923]

My friend offered me some Sodium Hypobromite, but I was like "NaBrO."

[@slyfergamingvideos7024]

+Hermione Granger woah.....

[@gamerave7399]

+Hermione Granger I think you mean Hypobromite HBrO 1-

[@willeberhardt5413]

+Game Rave Party pooper!!! its a good joke

[@coolbeans5911]

+Game Rave One does not simply correct Hermione Granger.

[@gabapentagram4923]

Carien Kotzé Damn right.

[@savannahspeer3247]

the jokes on here 😂. much funnier than they should be

[@michealjohn7192]

argon you my friend are the funniest person alive

[@harlangibson8468]

Sodium, sodium, sodium, sodium, sodium, sodium, sodium, sodium, Batman! (Hint: ME-TV) or how about... Two electrons were walking down the street and bumped into each other. One asks, "Are you okay." The other says, "No, I don't think so." "Well what's wrong?" "I think I lost an electron." "Are you sure?" "Yes, I'm POSITIVE" :)

[@psychedelicpain420]

How can an electron loose an electron? I think you meant an atom

[@harlangibson8468]

Oh, whoops. Haha yeah that's what I meant. Thanks!

[@whyyoulooking4944]

@@psychedelicpain420 the electron is inside the atom so he should say I lost a charge and electron is negative charged

[@psychedelicpain420]

@@whyyoulooking4944 I appreciate the effort, but I already knew that. What I meant was, that an atom can loose an electron, but an electron cannot loose an electron. An electron doesnt equal charge, but the difference between protons and electrons. That defines charge.

[@ladybuggoneforeign4748]

You guys seriously need to make a Physics Crash Course. I'm in Germany as a foreign exchange student and I'm learning these two subjects... without ever having learned them before. Your Chemistry courses are life savers. You should help me to keep from drowning in Physics as well. If you please. Actually, math would be really helpful as well.

[@kylematthews5438]

I like how this video is only nine years old, but the Table of Elements has updated since then. We found more!

[@blancrose2819]

I hope you know that you have literally been my chemistry teacher this year Hank. Thanks for all you do!

[@willlu3220]

when you science so hard you completely rekt some French dude who thinks he knows better

[@sarahvilhelmsen8768]

lol

[@crlnat4334]

Will Lu Is the French Chemist Paul-Emile (something) Boibaudran? With the element Gallium? I have a project on it due tomorrow

[@jimmyshang7777]

Will Lu I AM FRENCH

[@jimmyshang7777]

jk

[@jemappellelafayette5578]

oh

[@scottsterling9306]

As a high-school chemistry teacher, when I'm looking for a good video to support a section of the book, and I find one made by CrashCourse, I know my search is probably done. Thanks for making these captivating and informative videos, and I hope you see good fruits for your labor in the next generation of young scholars.

[@ramenshaman5201]

I just wanna take all these dead chemistry puns and Barium. Except for the oxygen and potassium ones. Those are OK.

[@Michael-lt7ym]

hehe

[@mikelangengakala7470]

XD

[@jasminemustafa3110]

hahaha I slapped my neon on that one

[@thg_2728]

these are pretty good lol, the only one I've heard is "did you hear that oxygen and magnesium were dating, I was like OMg"

[@eddieramirez2152]

These puns, they are sodium funny

[@ebkdoa3535]

My chemistry teacher gave me some Sodium Hypobromite, but I was like "NaBrO". He asked if that was supposed to be funny. I said, "That's my only chemistry joke, the other ones are boron, all the good ones argon".

[@TheMariomario12345]

omfg, all the comments are chemistry puns...

[@marvin9089]

Na its not all so dont be salty=D

[@TheMariomario12345]

omg why... xd

[@TheMariomario12345]

omg why... xd

[@Derpsii]

Unfortunately for me, all the good puns ARGON.

[@luckyscenario]

True, but they're Sodium good!

[@TilekMamutov]

Hank, I think you are amazing at showing how some scientists are real life superheroes like in this video or the one about Marie Curie. I am sure it helps hugely in attracting people, especially kids, to science. Very inspiring!

[@Evariley88]

pschh!! Kids!!! Im 25 and am horrible at chemistry! lol This was a link my teacher included in his lecture notes and now I can actually take my quiz and know what he's talking about! Thank you!!!

[@dangupman1641]

I need a CrashCourse Physics :) I love this channel

[@_rhys_music]

honestly this guy gets people interested in learning, not just kids

[@foreverinbloom14]

Omg this Mendeleev POV was crazy from start to finish xD

[@cwagoncwagon5906]

i bumped my neon a table

[@taysim2343]

cwagon cwagon omg I cant believe I laughed at that

[@dottoking8696]

oof

[@marthadraws4154]

This comment section is 5% questions and praise comments 5% talking about the comment section and 90% chemistry puns

[@guyonacomputer1261]

There should be an Action movie about Mendeleev so everybody understands how awesome/epic/badass he was.

[@TaylrTownsnd]

This.

[@guyonacomputer1261]

***** Forgive my ignorance, but what is "This" supposed to mean? "This is the stupidest thing I have ever heard" or "This is brilliant"?

[@IWantSoundKnowledge]

Adrian Garcia Is this your first time on the internet?

[@guyonacomputer1261]

***** Not at all, I just happened to not be familiar with the "this" meme.

[@1901180108]

John and Hank can make pretty much any subject interesting, but this series really shows how passionate Hank is about chemistry.

[@Xa15Sci0]

Has anyone ever paused the video during the intro theme and read all the facts littered across the screen? "This machine Pwns n00bs"

[@sea1sa124]

i have and its funny XD

[@talinapolis1551]

Ya know, I was looking through all of these helium jokes like HeHe, and then I thought to myself, should I tell a sodium joke? Na. Then I tried to find another joke to tell because all my good ones argon, but sadly all of them were too boron.

[@MGKrisi]

I want Hank to be my chemistry teacher at school cuz he is awesome!

[@cmsr7111]

this just helped me learn more about chemistry than i did in 3 years,sitting in a class room.

[@zoopoo3854]

Christine Salcedo how was 4 years later for ya

[@saqibmolla9591]

Someone threw sodium chloride at me..... I said," Thats a salt! "

[@miamafalda1118]

Is nobody gonna talk about how much of a badass Medeleev's mother was?

[@lahdeedah87]

Hank, you make me fall in love with science and knowledge. I just want MORE! Give me MORE!

[@lahdeedah87]

***** thanks! I'll check that out :)

[@astrid1870]

Yes! He made a reference to Narnia!! NARNIA FOREVER!!

[@josephstalin6549]

Everything is batman Such a cute picture

[@2b-coeur]

+Everything is batman I paused the video and went into the comments to look for this one and give it a thumbs-up ^u^ I really need to reread that series...

[@jayd203]

+Everything is batman at what time?

[@siene4079]

Astrid i’m concerend

[@psychedelicpain420]

Wanna hear a jk about nitrogen and oxygen? NO? Is it OK if I tell a jk about oxygen and potassium then?

[@anonimationghoul8798]

OK......OUUUUU I get it😂😂😂😂

[@lifeismeaninglessgirl6665]

whyyyyyy😭😭😭

[@Megasterik]

OK. I can tell you the one about potassium, nitrogen, and oxygen if you want.

[@allenthakur5757]

Psychedelic Pain noooooooooooo

[@skippitydippity]

OK

[@lolaenay]

That is insane. That is just amazing holy mother of Mendeleev. He was so sure and he was RIGHT omfg

[@horsecrazy2266]

5:09 is when he starts going over the table... The background of it is cool too, but when doing homework it can be better to watch videos for the least amount of time possible

[@billingino354]

Thanks he was talking bullshit

[@horsecrazy2266]

GSlovers Rock I mean.. It can be cool to know though

[@AngoAngo]

horsecrazy2266 Yeah, it wasn't really bullshit, I agree, history is good to know.

[@billingino354]

5 minutes not even going over the table? The history part can be a diff vid

[@horsecrazy2266]

GSlovers Rock It could be. But. It doesn't fit with any other subject, and there are enough people who are interested in the subject. I just realize that in homework, time can be a priority, so I commented the minute/second.

[@adsjndsoifjhediowasd]

The king really farted a noble gas today.

[@BioZombieExperiments]

You my good sir are a special kind of Star.

[@har12rocks]

gay low sac

[@theproductivejunkie9298]

how tf do you like NF

[@DT-jr8uq]

😂

[@allenthakur5757]

D T 🤕

[@gayavenkat]

I heard oxygen and magnesium were going out and I was like OMG

[@samsilva8240]

Can't thank you enough for telling about Mendeleev's story along the video. I had no idea about it and that caught my attention completely on the subject. In fact, something full of purpose is way more interesting to learn about, and here you linked it perfectly. Your content is amazing

[@Beautychictips]

Helped me in biology last year, helping in chemistry this year.

[@ingridsalinas731]

Yasmine Scego same

[@TheGhostbuster1989]

Dmitri Mendeleev, The original Avatar

[@finelbraincell5751]

10 years old and still amazing.

[@lucashebberd353]

You are not worthium - Thorium

[@damnage97]

Mendeleev... the Chuck Norris of science... what a badass.

[@pamstacey6395]

You guys should do a physics course covering the basic laws of motion and the big bang as well as cosmology and general relativity and black holes. I think people would love to know more about the way things move as well as the origin of the universe.

[@jamestyler3698]

Love the Chronicles of Narnia reference. You're clearly a superior human being. Please never stop being Hank.

[@fairytaleoverworlds7795]

This video hypnotized me-- now I know I AM Mendeleev.

[@cianster2k11]

My science teacher showed us this

[@loganjmcquaid]

Props to your teacher. I believe a lot more teachers should utilize these videos. My AP World History teacher showed us the World History series by John and I've been a fan of crash course ever since

[@asdfgh123456978]

I wish my teacher showed me this...my chemistry teacher is just so boring. I have to find all this additional information myself.

[@nickfilipoff9056]

asdfgh123456978 same here -_-

[@nickfilipoff9056]

Catia Park I'm a junior in high school... And if you notice my profile picture, its very old, at least a few years... and that might be why you're asking... Yeah, I need to change it, but I keep forgetting, and I'm never on my account

[@horsecrazy2266]

Catia Park But you already know about it :). I really encourage you to watch all of the ones you're going to need for future classes and memorize them... I really wish I'd known about these before, now I'm watching them all right before finals and doing it

[@tomisoetan9061]

you rock mendeleevs mom! we acknowledge you!

[@tfhigfrth9889]

Teacher sent us here, didn’t think I’d enjoy it this much😃

[@thelolminecrafter7830]

3:50 *AGGRESSIVELY FLINGING PAPERS*

[@Elizabeth-ty8ho]

There's hydrogen and then helium lithium beryllium boron carbon everywhere nitrogen all through the air and oxygen so you can breath Fluorine for your pretty teeth neon to write up the sign sodium for salty times magnesium… You do the rest I can't memorize all those

Aluminum Silicon

[@Elizabeth-ty8ho]

potassium

And Calcium so you'll grow strong.

[@musictvrox777]

Benjamín Valdés Vera scandium titanium vanadium chromium and manganese this is the periodic table noble gases stable

[@musictvrox777]

halogens and alkali react aggressively each period we'll see new outer shells

[@TheEckert01]

That imagination round was incredible. Kudos for, yet again, making me feel and connect with a part of history.

[@ren514]

"theyre always jonseing to hook up with a hottie from the other side of the table..." Hank youre great

[@howardxie3412]

It’s coronavirus that brought us together

[@shadenox6933]

"To be clear (let me use a fancy and complicated word to make things clear) this is pure conjecture"

[@chaitu-gb7ww]

would it be absolute coincidence that the moment i read this comment the video played the same dialogue

[@lilepopinyou]

I legitimately just wanted to know about the periodic table of elements I’m so glad I found you here sir

[@dreavilo6874]

All these videos are awesome. Its been 10years + since I have taken Chemistry and now Im back in college taking it ... These videos are helping me prep for whats to come....

[@meiyang5969]

I was a chemistry major late 70’s and went on to healthcare field. Now that I’m retired, I want to relearn the periodic table. Just curious how it changed 50 years later. Thanks for the insight. 😊

[@coreybeavers8762]

Thank you for helping me pass biology and chemistry! I definitely couldn't have done it without this show.

[@kindcycles]

Great video! We're homeschooling right now and your videos are really helpful. Thanks for all you do.

[@thedarkphantom-lo3tw]

A nuetron walks into a bar. The waiter says “ for you , no charge”

[@nicobellic2238]

5:00 Mendeleev was the Avatar confirmed.

[@gamerave7399]

There's a mistake at 6:27. Ionization energy is defined as the amount of energy required to remove one electron. Since the halogens have 7 valence electrons and want to gain one electron, it would require tremendous amounts of energy to remove one; hence, the HIGH, resulting ionization energy,

[@Gemmaaloves1D]

THANK GOODNESS FOR YOUR KZbin I HOPE TO GOD I DONT FAIL MY EXAM TOMORROW

[@csgaiao33]

Damn. Hank is everywhere. I've seen him on like 5 different channels. I don't mind. He explains stuff neatly

[@readingrainbow417]

That moment when you and Mendeleev have the same belief

[@readingrainbow417]

Beliefs**

[@gaud9112]

'cause you are Mendeleev, Master of the elements ! So deep !

[@forevergoingforward]

Could you make a video on the trends of the periodic table? That would be EXTREMELY EXTREMELY EXTREMELY x200000000000000 helpful! :)

[@AniMaria1014]

ok, so everyone here is making chemistry puns, but am I the only one who was dying over the horses' legs at 1:24 XD I couldn't stop laughing

[@jonikoponen1369]

by far the best episode ive seen on CC. this one is built around story whereas others feel like information overload

[@-simplypastel-873]

I was going to make a salt pun.....but "Na"

[@v0idptr]

Salt isn't Na

[@justinyoung8453]

Salts NaCl 😂

[@v0idptr]

Young Vigilante yea you should've replaced "salt pun" with "sodium pun"

[@StonyRC]

+-SIMPLYPASTEL- Oh Good Grief ... made me laugh tho!

[@justmovedin]

+-SIMPLYPASTEL- Well I was going to make a potassium pun, but K.

[@AlanHirschenhoferII]

Do not wait your whole life to learn what's important now! I have learned many things in my life I would have laughed at anyone suggesting that I would one day pass Trigonometry, Calculus, Biology etc... with a 4.0 gpa and actually use these subjects in my real life. I have been a soldier (Lance Missile systems, N.B.C. "Nuclear Biological & Chemical Operations NCO) as a civilian, I've been a Police Officer, Firefighter and now a retired Professional Line Haul Truck Driver) and I used every bit of my education in all of these job's! The remarkable thing is, While in High school, My gpa was a joke, I just didn't care. I failed all my math classes, never past chemistry, and only had two "A"'s, one in child and the other (strangely) in Greek mythology. My point is, to those of you younger ones, NEVER EXCEPT ANYONE TELLING YOU TO JUST QUIT! They and believe me "YOU" most of all have no clue yet where your life will lead you.!!!!!! Do not give up, if someone as screwed up as I was can make it....so can YOU!!!!

[@albus6966]

When you see the comment section filled with chem jokes😂😂

[@camilorodriguez2334]

amo estos videos, ya tenia canales parecidos que me explicaran las interpretaciones de fisica y un poco de matematicas, pero me faltaba alguien que me explicara mi tan odiada quimica, y es justo el canal y el contenido que buscaba. Gracias

[@MSC813]

my science teacher is practically a gym teacher. Thank you hank for helping me learn!

[@princessisa431009]

omfg same

[@Soul-qt8bp]

BEST ONLINE TUTOR EVER ! LOVE UR VIDEOS !! KEEP IT UP@@!!

[@eleanorjacobobecker3417]

Ive been studying for a chemistry test for the past 5 hours (my mental state is not stable) so Mendeleev's determination made me sob

[@evanl6819]

I love these videos, I mean I'm not technically learning anything new because I've learnt all this doing A levels, but you explain things so much better than my teacher so it sticks in my head better.

[@brookereutinger5063]

When my teacher pulled up crash course I had a huge fangirl moment. Is that bad😂?

[@ScareSans]

"you are Mendeleev. Master of the Elements." wait... does this mean Mendeleev was the *Avatar!?*

[@quibily]

I just started reading The Disappearing Spoon by Sean Kean--which is a creative, anecdotal intro of Chemistry. So far, it's a great companion read to the Crash Course Chemistry videos.