| A | B |
|---|
| metals | good conductors of heat and electricity |
| nonmetals | poor conductors of heat and electricity |
| semiconductors | intermediate conductors of heat and electricity |
| proton | positively charged part of nucleus |
| neutron | neutral subatomic particle in the nucleus |
| electron | negatively charged subatomic part surrounding nucleus |
| transition metals | Groups 3-12 on Periodic Table |
| cation | positive ion |
| anion | negative ion |
| nucleus | center of an atom |
