people of the atom

Question 1

democritus

Answer 1

disagreed with the idea of infinitely divisible matter, proposed that matter consisted of tiny particles with nothing between them but empty space called “atomos”

Question 2

dalton

Answer 2

elements composed of atoms
an atom of same element have a same properties, atoms of different elements have different properties
atoms not created nor destroyed or changed into different types during reactions
c reaction is separation, combination , rearrangement of atoms
compounds are combinations of atoms in specific ratio

Question 3

thomson

Answer 3

found electrons

realised that atoms could be divided further

plum pudding model: electrons embedded in positively changed mass

Question 4

rutherford

Answer 4

proposed the atom consisted mostly of empty space

electrons orbited around nucleus. most of mass was in the nucleus, all positive charge was located in the nucleus carried by protons

Question 5

bohr

Answer 5

electrons were in electrons shells around the nucleus, each shell has a specific amount of energy

Question 6

chadwick

Answer 6

discovered the existence of neutrons that accounted for around half the mass of the nucleus, had neutral charge