A) Their split evenly between stable and unstable
B) It is not known at this time
C) Stable
D) Unstable

A) At some point give off radiation.
B) Break into a lower atomic numbered atom
C) Two of the answers are correct
D) Become a higher atomic massed atom.

A) Prevents the electrons from flying off into space around the nucleus.
B) Prevents the protons from repelling the neutrons out of the nucleus.
C) Hold the neutrons together in the nucleus of an atom.
D) Prevents the positive charges of the protons from tearing the nucleus apart.

A) Half of the time it takes all the material to decay.
B) How much of half of the material will decay in half the time.
C) How much of the material will decay in half a century.
D) How long half of the material takes to decay.

A) Gamma
B) Alpha
C) Beta
D) Delta

A) Alpha
B) Delta
C) Beta
D) Gamma

A) Beta
B) Alpha
C) Delta
D) Gamma

A) Alpha
B) Alpha and Gamma
C) Alpha and Beta
D) Alpha, Beta and Gamma

A) Many of the pioneers of nuclear physics died of prolonged exposure to radiation.
B) All three types of radiation emit high energy particles which damage the molecules of the cells.
C) Radiation can cause ionization of the cell's molecules.
D) Radiation has no known benefit to humans.

A) Hold the neutrons together in the nucleus of an atom.
B) Prevents the positive charges of the protons from tearing the nucleus apart.
C) Prevents the electrons from flying off into space around the nucleus.
D) Prevents the protons from repelling the neutrons out of the nucleus.