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

This video covers:
- Democritus - Atomic Theory
- John Dalton - Solid spheres
- JJ Thomson - Plumb Pudding model
- Ernest Rutherford - Nuclear Model
- Niels Bohr - Electron shells
- James Chadwick - Neutrons

General info:
- Suitable for all GCSE and IGCSE courses
- Suitable for higher and foundation tiers
- Suitable for triple and combined science

Exam board specific info:
AQA - Everything is relevant to your course!
IGCSE Edexcel - Everything is relevant to your course!
Edexcel - Everything is relevant to your course!
OCR 21st Century - Everything is relevant to your course!
OCR Gateway - Everything is relevant to your course!

Related videos/topics:

GCSE Chemistry playlist:

GCSE Biology Playlist:

GCSE Physics Playlist:

[Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are:
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- A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts.
- A comprehensive bank of past exam papers, organised both by year, and also by topic.

Amadeus & Tom

[mathew]

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.

[yournotgully]

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.

[uwu]

fun fact: youre not here because you want to. youre here because this channels playlists are the only thing saving you from failing all your gcses and end of year tests because your teacher didnt want to or if youre like me they ran away crying from your class and now youre cramming information into your brain on a test that you dont even know what is on other than chemistry yet you know nothing yoire supposed to be revising as you werent taught anything.

hi. my names ryan, and my life is kinda crazy!

[ASHO-shwv]

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

[raoasifaliali]

Amazing video. Very informative and had a clear concept.

[fateful]

Here to revise for my science test, your videos are really helpful for revision on my science topics, thank you!🫶🏼

[blueleafy]

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

[yes]

to remember the names of the scientists:

Dont
Teach
Rude
Boys
Chemistry

dalton
thompson
rutherford
bohr
chadwick

[xxinaa]

you are so underrated. this is such an amazing video and condenses things but still helps point out key stuff. thank you! please continue making videos <3

[elliegoodfellow]

If you’re also here bc you have hmwk you don’t understand 😌

[Rennysleepy]

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

[gaiacooper]

great! REALLLY useful for year 10 physics!😁

[RohitPraveen-kosv]

This video is SOO helpful!! I’ve watched it twice cause I took triple science, once for homework (this helped me make a 3 page essay) and revision

[lucyquinn]

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

[AbigailFarley-mg]

bro be casually saving my exams in a month 😭

[ibrahimbjoe]

Subscribing to this channel was not a mistake for me and I will forever be grateful. Thank you cognito 🧠🎤📖📚 much love from Sierra Leone 🇸🇱🇸🇱🇸🇱

[elfaroukmoustafa]

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

[knowingchemistry]

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 😊

[blastingtw]

Thx Man U helped a lot with some stuff I gotta do