alpha scattering and the nuclear model

Question 1

what did scientists discover in 1897?

Answer 1

that atoms have tiny negative particles which are called electrons

Question 2

what does this show?

Answer 2

that atoms aren’t spheres that can’t be divided and atoms have an internal structure

Question 3

what is the plum pudding model?

Answer 3

that an atom is a ball of positive charge with negative electrons embedded in it

Question 4

what does the alpha scattering method include?

Answer 4

tiny alpha particles being shot through gold foil (most went through) so this meant atoms are mainly empty space

Question 5

what does it mean when alpha particles were deflected?

Answer 5

that the centre of an atom must have a positive charge and that repelled the alpha particles

Question 6

what does it mean when alpha particles bounced back ?

Answer 6

that the mass of an atom must be concentrated in the centre which is now called the nucleus

Question 7

what did niels bohr propose?

Answer 7

that electrons orbit the nucleus which agreed with other scientists so we call the orbit energy levels/shells

Question 8

what did james chadwick discover?

Answer 8

that the nucleus contained neutrons so they have no charge and are neutral