Nuclear Chemistry

Where does radioactive decay occur?

• energy levels of the atom

• In the nuclei of a radioisotope

• In the air

• In a nuclear reactor

How does an unstable nuclei become more stable?

• By giving out alpha particles only

• By giving out beta particles only

• By giving out gamma radiation

• By giving out either an alpha, beta particle or gamma radiation

Which nuclide notation represents an alpha particle?

• 4

  He

  2

• 1

  P

  1

• 0

  e

  -1

• 1

  n

  0

How are alpha particles stopped?

• By a few centimetres of concrete.

• By a few centimetres of aluminium

• By a few centimetres of paper

• Nothing will stop them.

What charge is on an alpha particle?

• negative

• positive

• neutral

What are beta particles?

• electrons ejected from the nucleus

• protons ejected from the nucleus

• neutrons ejected from the nucleus

• 0

  e

  -1

Beta particles are stopped by....

• thin sheet of paper

• thin sheet of concrete

• air

• Thin sheet of aluminium

The charge on a bete particle is ...

• positive

• neutral

• negative

Gamma radiation is ......

• Electromagnetic waves emitted from the nucleus

• proton emitted from the nucleus

• neutron emitted from the nucleus

• electron emitted from the nucleus

Gamma radiation cannot be stopped but can be slowed down by.....

• air

• paper

• aluminium

• thick concrete and lead