GCSE Chemistry - History of the Model of the Atom #7

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incase anyone needs to take notes, i wrote out the important parts from JJ thomson J.J Thomson Plum pudding model 1897 Atom = ball of positive charge with discreet electrons stuck in it Ernest rutherford 1909 Took positively charged alpha particles and fired them at thin sheet of gold If the positive charge in the gold atoms was generally spread out, as JJ thomson had proposed, with the plum pudding model. then the alpha particles should pass right through the gold because the weak spread out positive charge wouldnt be strong enough to effect them. weirdly though what actually happened was some of the alpha particles deflected to the side, and a small number deflected back the way they had come. proving jjs theory wrong. Nuclear model- instead of a general field of positive charge, there was some sort of compact nucleus which contained all of the positive charge of the atom. and he thought that the negative charge must exist in some sort of could around the nucleus. at this point, rutherford was already pretty close to how we currently understand the atom, but his model, had one flaw. namely, there didnt seem anything stopping this cloud of negative electrons from rushing in towards the positive nucleus. meaning that the atom, should just automatically crash. which we know it doesnt. just 4 years later though, in 1913 a man called niels bohr suggested a solution. he suggested the electron orbited the nucleus, in a similar way to how the planet orbits the sun. and also that they were held in shells. this idea was really important. because the orbiting of the electrons, is what prevents the atom from collapsing. in the years since then. many experiments have supported this model. and its pretty much the same one we follow today, with just a few small changes. further experiments by rutherford, found that the positive charge in the nucleus, is actually made up by small discreet particles, which are now known as protons. and a short while later, a guy called james chadwick provided evidence for a neutral particle in the nucleus. which are now known as neutrons.

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@@quaintrelle881 its discrete rather than discreet but other than that

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Im a freshman and my science teacher gave me a project to write about these 6 scientists and how they developed the atomic model. This video literally saved me from reading tons and tons of articles to find information. Thank you so much man.

[@ASHO-sh1wv]

1897: JJ. Thomson: AHH yes a new scientific breakthrough my whole life I've worked for this what should I name it? WAIT I'VE GOT IT.... Plum pudding Model

[@Anush_Sivakumar]

he later called it water melon model then he called it apple pie model LOL

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Dang, that man must've been very hungry during it's discovery lol

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and bc I have a test in under an hour and idk what tf an atom is

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at 1:53 the cc say out four but they mean alpha, just in case you were confused

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Amazing video. Very informative and had a clear concept.

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to remember the names of the scientists: Dont Teach Rude Boys Chemistry dalton thompson rutherford bohr chadwick

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Thank you so much, sir. Your explanation helped me revise one topic from my Chemsirty test.

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@@barcaedition9832 i think it all depends on the school. I do this in year 10, some schools do in year 11, and others in year 9

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[@blueleafy7167]

This is way more entertaining than looking through notes so I am gonna watch a bunch of these until I eventually just remember the models

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You're a hero for making this.

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Tried to advance study about Atomic Models and this helped alot!!

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I have already read quite a few articles related to atomic theory but your videos sir always present something new and unlooked fact !! Thanks for the video 😊

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Thanks for this very educational video

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[@yashialw]

I'm not sure if I got this wrong but I was taught that the expected results for the Gold leaf experiment was that the alpha particles would be repelled BECAUSE the atoms were said to be solid spheres of positive charge with negatively charged particles embedded within it. So when the alpha particles would come in contact they would be repelled. Instead, most passed through suggesting atoms are mostly empty space with very few being repelled or deflected suggesting there was a positive charge but it was very small and in the centre of the atom. If you could, could you clarify if this is the wrong information? because in the video it says something else?

[@humanrainestorm5506]

I know this comment is pretty old, but I was taught this too. Do you now know what's right and what isn't? I'm very confused now, and would like an answer.

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Ive read some articles and it seems this video stands true to its word. I dont know where you got that information as i was taught exactly this

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I immediately understand these atoms,and i like this lessons,because it inspires me a greater education to all,and ty for this

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Thankyou Elsa!! glad the video helped 🙌

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Excellent resumé. Thank you!

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A very helpful and concise explanation: thank you!

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What about the Quantum Atom?

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Ernest Rutherford brought about the term 'protons', right?

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TYSM I HAVE AN ESSAY ON ATOMIC STRUCTURE DUE AND I WAS SO CONFUSED

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I have the hsc in an hour and I’m watching this now! Am i tucked or what!

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how about sommerfeld-bohr? or schrodinger.

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not the most replayed being the plum pudding

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[@pistonjab4515]

Erm, except Niels Bohr's orbiting theory was mostly rejected and Erwin Schrodingers theory that the electron movements are more sporadic/random took over. Yes or no? I'm new to this.

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Wrong the concept of small, indivisible, self-revolving particles that make up matter was first proposed not by Democritus but by Kanad in his book 'Vaisheshika Sutra' around 600 BC

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