Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
5 Cards in this Set
- Front
- Back
|
Leucippus and Democritus |
Consuming grapes and whine has idea that if you divide a substance enough you’ll get the smallest kind of something Atoms aré indivisible |
|
|
John dalton |
Atom is a sphere cannot be divided and is small Did work with pressure made by mass and said that atoms of each element had different mass and all given elements are idénticos in mass and properties His model is the billiard ball model |
|
|
Ji Thomson |
Used cathode rays to realize that there are small electrons Atoms a sphere that’s positive and negative has electrons that could be apart from nucleus His model is the plum pudding model |
|
|
Ernest Rutherford |
By shooting alpha particles at gold realized that atoms are mostly empty with nucleasue within and electrons on the outside Alpha particales deflected proving that something positive was there since alpha particales are negative Made the planetary model |
|
|
Neils Bohr |
Electrons are divided into levels Electrons go high and when they go back down photons of light will fly Proposed Bohr model of the atom |
