important figures of unit 3

Question 1

what is the chronological order of people

Answer 1

1. democritus
2. dalton
3. thompson
4. milikan
5. rutherford
6. bohr
7. Schrodinger

Question 1

democritus

Answer 1

first to discover atom
1. everything is composed of atoms
2. atoms are indestructible and always moving
3. there is empty space between atoms

Question 2

dalton

Answer 2

solid ball model 1803
- all matter is composed of extremely small particles called atoms
- atoms of a given element are the same different are different
- atoms cannot be created destroyed or subdivided
- in chemical reactions, atoms are rearranged

Question 3

which part of Daltons theory was not true

Answer 3

all atoms of an element are identical- they can vary in neutron and atoms can be destroyed

Question 4

thompson

Answer 4

plum pudding model 1904
- cathode ray tube to discover negative particles (electrons)

Question 5

milikan

Answer 5

oil drop experiment to determine the charge of an electron

Question 6

rutherford

Answer 6

nuclear atom model 1911
discovered the nucleus through the gold foil experiment

Question 7

bohr

Answer 7

planetary model 1913

Question 8

schrodinger

Answer 8

quantum model 1926
electrons do not travel in fixed orbits but in waves