Some substances are radioactive. they may emit Alpha or Beta particles.

describe the characteristics of Alpha and Beta particles in terms of their:

- Structure

- penetration through air and other materials

-deflection in a electrical field.

Alpha Particles:

Slow and heavy Low penetrating power (can be stopped with a sheet of paper) Large charge (ionize electrons from atoms strongly) Have two protons and neutrons

Beta Particles:

Fast and light Medium penetrating power (can be stopped with aluminum or plastics) Charge not as strong as alpha particles (they ionize atoms that they pass by) Same mass and charge as electrons