Programme 17: Atomic Structure

Answers to Activity Sheet 1

Programme Questions

This activity consists of a series of questions which can be answered by students as they watch parts of the programme.

Atomic Structure 1. Cathode rays
2. Light because heavy particles would be harder to deflect.
3. Deflection would increase with increased field.
4. So that his radioactive particles would not collide with air molecules.
5.

	Electron	Proton	Neutron
Charge	-1	+1	0
Mass	0	1	1

Atomic Number and Mass Number

1. Hydrogen
2. Yes, it goes up by one each time.
3. The number of protons.
4. The mass number is bigger.
5. The number of protons plus the number of neutrons.

Electron Structure

1. In shells around the outside of the nucleus.
2. 2
3. 8, 8
4. 2.8.2. It belongs to Group 2.