Atomic Structure

Question 1

During nuclear fusion the total mass of particles…

Answer 1

Decreases

Question 3

How does an atom become an ion
What charge does the resulting ion have

Answer 3

Electron
A positive charge

Question 4

Three environmental issues caused by generating electricity using nuclear power stations

Answer 4

Waste is radioactive
Waste has a long half life
Risk of catastrophic events

Question 5

Explain what led to the plum pudding model being replaced by the nuclear model of the atom

Answer 5

Alpha particle scattering experiment
Positively charged alpha particles directed at thin sheet of gold foil
Most passed straight through so most of atom is empty space
A few alpha particles deflected through large angles
So mass is concentrated at the centre of the atom
And nuclei is positively charged
Plum pudding model has mass and charge spread throughout atom