click below
click below
Normal Size Small Size show me how
RADIOACTIVITY
Chapter 19
Question | Answer |
---|---|
radioactive element | elements that emit alpha, beta or gamma radiation |
alpha particle | two protons and two neutrons or a nucleus of a helium atom |
beta particle | an electron ejected by an atomic nucleus |
gamma radiation | extremely energetic form of radiation with no charge and no mass |
strong nuclear force | very strong force that holds the nucleus together |
transmutation | when one element changes to another by emitting an alpha or beta |
half-life | time needed for half the radioactive atoms to decay |
fission | splitting of atomic nucleus into parts; releases energy |
chain reaction | occurs when the product of the reaction starts another reaction |
fusion | small nuclei fuse together producing energy |