old guys

Question 1

democritus

Answer 1

matter cannot be divided forever, eventually. the smallest piece would be obtained, it would be nearly invisible

Question 1

dalton (4)

Answer 1

All elements are composed of atoms.

Atoms are indivisible and indestructible.

Atoms of the same element are exactly alike.

Compounds are formed by the joining of atoms of two or more elements

Question 2

thomson

Answer 2

identified the electron, plum pudding model - positively charged cloud w/ electrons

Question 3

rutherford

Answer 3

mostly empty space, dense nucleus (positively charged) w/ electrons orbiting, gold foil experiment

Question 4

what was the gold foil experiment

Answer 4

firing radioactive particles through extremely thin metal foils (such as gold), leading him to his theory that most of the atom was made up of ‘empty space’.

Question 5

bohr

Answer 5

electrons move in definite orbits around the nucleus - these orbits are located at certain distances from the nucleus

Question 6

chadwick

Answer 6

In 1932 Chadwick discovered the neutron,