Worusu NOW
Write the letter of the definition next to the matching word as you work through
the lesson. You may use the glossary to help you.
strong nuclear force
A. the spontaneous discharge of energy from
an unstable nucleus
radioactivity
B. the time required for half of a sample of
a radioisotope to decay
weak nuclear force
C. the force that binds neutrons and protons
together in the nuclei of atoms
half-life
D. an atom with an unstable nucleus that will
eventually go through radioactive decay
radioisotope
E. the force that is responsible for the type of
radioactive decay known as beta decay