The 2,400-year search for the atom - Theresa Doud

How do we know what matter is made of? The quest for the atom has been a long one, beginning 2,400 years ago with the work of a Greek philosopher and later continued by a Quaker and a few Nobel Prize-winning scientists. Theresa Doud details the history of atomic theory.

Lesson by Theresa Doud, animation by TED-Ed.

[youanditsmorethanlike]

Time stamps of people that talk about atoms
0:28 Democritus
1:14 John Dalton
1:55 J.J. Thompson
2:28 Ernest Rutherford
3:29 Niels Bohr
4:12 Werner Heisenberg

[romblzaj]

My science teacher showed us this in class today :3
I'm proud of you, Ted Ed.

[winniieww]

hi if your teacher assigned you to watch this :) Good luck on your exams!

edit: where did the likes come from 😃

[chemistryenthusiast]

I am in 9th grade Chemistry, and this really elaborated on the lecture of my teacher. GOD BLESS TED-ED

[sloz]

Who's here from science class?? Like it

[dadams]

Aristotle-Earth Wind Fire water. John-combinations of particles. Democritus-shape and size vary. Full of empty space. Thompson- discovered electron Ernest-largely of empty space, concentrated center. Niels Bohr- electrons have fixed distances and patterns of moving around nucleus’s r. Heisenberg-impossible to pinpoint electrons and their speed.

[strangegrape]

notes that i need for essay:

1) over 2400 years, the theory of atoms has changed
2) in 440 BCE democritus proposed that everything was made of small particles with space around them
2) he thought that the size varied depending on what they make
3) the word “atom” comes from the greek word “atomos” which meant indivisible
4) in 1808 some guy called john dalton showed that stuff broke down into different elements and proportions
5) he theorised that the compounds of elements were made of atoms that couldn’t be created or destroyed
6) in 1897 jj thompson discovered electrons using cathode rays
7) he then went on to create a “plum pudding model” for how the atom looked
8) by shooting alpha particles at a sheet of gold foil ernest rutherford discovered protons as some of the alpha particles were deflected from the gold
9) he concluded that atoms were mainly filled with empty space with a few electrons on the outside and a dense “nucleus” of protons
10) later james chadwick in 1932 discovered neutrons were in the nucleus
11) niels bohr thought that electrons went around the nucleus at fixed distances, but they could jump between the fixed distances
12) werner heisenberg concluded that you couldn’t determine the exact position and speed of an electron

[arandomguy]

Does anyone have this as coronavirus homework

[tarekazuzu]

Democritus has the honor of biggest "I told you so!" in history

[ZYlol]

Even though I'm only a second language science learner from primary. This video is really nice, and easy to understand. It make my teacher's explanation work much easier! Nice job, love your videos.

[michatarnowski]

It's a pity that Avogadro wasn't mentioned; he seems to be overlooked and underrated in general. Dalton's atomic model was in many ways mistaken and is heavily outdated.

[russellhowell]

Safe to say, I don't like these online classes.

[patriksl]

TedEd. Please never change anything, your doing service to humanity.

[francotejerina]

Short, understandable and incredibly fun! Great work.

[DuckySOT]

Is anyone else from online school doing science

[yourmom-zsui]

WASSUP PEOPLE DOING THEIR HOMEWORK 😄😄😐

[klickxy]

POV: you came here from missing work in school

[BestFitSquareChannel]

another gem… linking contributors brilliant… demonstrates time, rigor required to refine theory to mutable knowledge… how one construct often leads to more discovery… bravo!

[alexandery]

Thanks! That would help me on tomorrow's chemistry test on Greek philosopher and international scientists that made huge effort and lived for not so long time ago.

[ziadwael]

Aristotle had watched a lot of The Avatar