Unit 1.2 Nuclear Chemistry

A radioactive isotope has a half-life of 5 years. If you start with 40 grams of this isotope, how much will be left after 20 years?

• 20 grams

• 5 grams

• 10 grams

• 2.5 grams

• nuclear fission

• nuclear fusion

• nuclear fusion

• nuclear fission

This type of radiation has high penetrating power and is very dangerous to human health.

• alpha

• beta

• gamma

This particle has the weakest penetrating power. It can be stopped by a piece of paper or clothing.

• alpha

• beta

• gamma

This particle has medium penetrating power. It can penetrate skin and paper, but can be stopped by plastic or metal foil.

• alpha

• beta

• gamma

• an alpha particle

• a beta particle

• gamma rays

• a neutron

• alpha

• beta

• gamma

• organic

• alpha

• beta

• gamma