| A | B |
|---|
| electric force | force between electric charges such as protons & electrons |
| strong force | force that causes protons & neutrons to be attracted to each other |
| radioactivity | process -- nucli decay & emitting of matter & energy |
| gamma ray | electromatic wave - no mass, no charge, speed of light |
| alpha particle | composed to 2 protons & 2 neutrons, not strong enough to hold together |
| beta particle | high energy electron emitted when neutron decays into proton |
| transmutation | process - changing one element into different element |
| chain reaction | series of repeated fission reactions caused by additional neutrons in every fission |
| electric current | net movement of electric charges in single direction |
| tracer | radioactive isotope used to follow course of chemical or biological process |
| half-life | time it takes for half of nuclei in isotope to decay |
