1.What do you call the centre of an atom?

• electron

• nucleus

• proton

• neutron

A stable atom has:

• Equal numbers of Protons & Electrons

• Different numbers of Protons

• Equal numbers of Electrons & Neutrons

• Equal numbers of Protons & Electrons

How many types of radiation are there?

• 3

• 9

• 2

• 4

Radiation is emitted from:

• all atoms

• most atoms

• unstable atoms

• stable atoms

An alpha particle consists of:

• 2 protons

• A high speed electron

• A wave

• 2 protons and 2 neutrons

Beta radiation is:

• 2 protons

• A high speed electron

• A wave

• 2 protons and 2 neutrons

Gamma radiation is:

• 2 protons

• A high speed electron

• A wave

• 2 protons and 2 neutrons

Alpha is stopped by:

• Thick lead

• Thin paper

• A few cm of air

• Aluminium

Beta is stopped by:

• Aluminium

• Paper

• Lead

• Concrete

Gamma is mostly stopped by:

• A few cm of air

• Thick lead

• Aluminium

• Paper