| Term | Definition |
| element | matter made up of atoms of only one kind |
| electrode | a peice of metal that can conduct electricity |
| anode | one electrode with positive charge |
| cathode | one electrode with negative charge |
| electrons | negativly charged particles |
| proton | positively charged particle found in the necleus |
| neutron | neutral particle found in necleus |
| electrom cloud | region surrounding the necleus |
| atomic number | number of protons a element has |
| isotopes | atoms of the same element that have different numbers of neutrons |
| mass number | number of neutrons plus number of protons |
| radioactive decay | the release of necular particlesand energy |
| transmutation | the changing of one element to another though radioactive decay |
| alpha particle | two protons and two neutrons that may be realsed during transmutation |
| beta particle | high-energy electron that comes from the necleus not the electrom cloud |
| half-life | the amount of time it takes for half of a sample of an element to decay |
| carbon dating | process used to estimate how long ago something lived |