How to Find Valence Electrons! (and Total Electrons)

You can find valence electrons with a shortcut using the periodic table, but it’s good to only do that after you understand why the shortcut works, and to do that you have to draw out the full electrons and orbitals for a few different atoms. Valence electrons are just electrons in the last orbital, they are different from core electrons, which are the total number of electrons except the valence.
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This was an excellent video. I was able to learn the extended and short methods involved in finding valence and total electrons. Thank you for the help.

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OMG, thank you so much, I have a lot of trouble with the Periodic Table and finding the Valence Electrons. It is always confusing to me but now I finally understand. Thank you!!

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This explanation was awesome! Thank you so much

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Samiullah Hanify so glad it helped you!

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glad to help!

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[@aliashraf9180]

According to this video third shell can hold up to 8 electron but according to to rule of 2n^2 third shell can hold up to 18 electron. Can anyone explain this

[@RobinReaction]

Ali Ashraf I’m not including the d orbital in this video, this is an intro video for explaining the octet rule and how to find valence electrons. You’re right though, if you include the entire third shell including the d portion it can hold up to 18e

[@aliashraf9180]

@@RobinReaction if I am right than how do atoms gain stability by octate rule

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That’s more complicated than I can explain here, I would search around on KZbin for different videos!

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Umm.. hey I just wanna ask. I am familiar with the short cut but we are not gonna use the periodic table for the exam so we have to do it manually... are there any ways on how to solve it?

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if you're not allowed to use a periodic table, you'll have to memorize where the elements are. Too bad, that sounds annoying to do!

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[@zgamerboy325protechworks5]

How about potassium? How many valence electrons if it is a 1 positived charged element?

[@gigivlls1806]

THANKS

[@bruceduncan9067]

I have never heard of more than three shell please explain or give an example

[@itxzela]

i am confused, How do you know when the element has one more electron or less electrons?

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[@itsme4065]

How to find valance electrons for transition metals and post transition

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Technical Guy that’s not in this video, I would suggest searching for another video to answer that question!

[@itsme4065]

Ok

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4th shell can hold how many electrons

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[@maggie3391]

What about elements that have more than 20 total electrons?

[@tamareajones8608]

The third subshell can hold a maximum number of 18 electrons. This is designated by the 2n^2 equation if you plug in 3 for n which represents the third subshell. On the detailed screen you wrote it can hold up to 8 electrons. Does this mean the third subshell can hold up to 8 valence electrons? Could you please clarify.

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it holds 18

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Tamarea Jones is that 2n squared?

[@chlsey3372]

yes the third shell can only hold up to 8 valence electrons

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I also need answer to this question can anyone explain this

[@chlsey3372]

@@aliashraf9180 okay the third shell can hold up to 18, however *if it's the most outer level, it can only hold 8 (this applies to all outmost levels).*

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How about the Hidrogen? how can we find?

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[@farfymcdoogle3461]

Nope 👎 Iodine has 3 valence electrons, not 7. I drew it out twice... 53 total electrons, 2 in the first orbit, 8 per orbit moving outwards until you get to 53 total electrons. There are 8 orbits with 3 valence. Please explain!

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I thought 3rd shell can hold up 18 electrons

[@RobinReaction]

if you include the d orbital, but that comes after all the examples i show here and isn't helpful for predicting valence electrons.

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3rd shell is wrong

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[@maddie2065]

OMG, thank you so much, I have a lot of trouble with the Periodic Table and finding the Valence Electrons. It is always confusing to me but now I finally understand. Thank you!!