the process by which an unstable nucleus gives off nuclear radiation.

the sum of the numbers of protons and neutrons in the nucleus of an atom.

an atom that has the same number of protons as other atoms of same element do but that has a different number of neutrons.

the time needed for half of a sample of a radioactive substance to undergo radioactive decay.

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Question	Answer
Radioactivity	the process by which an unstable nucleus gives off nuclear radiation.
mass number	the sum of the numbers of protons and neutrons in the nucleus of an atom.
isotope	an atom that has the same number of protons as other atoms of same element do but that has a different number of neutrons.
half life	the time needed for half of a sample of a radioactive substance to undergo radioactive decay.