| A | B |
|---|
| Positive ion | when an atom loses an electron |
| alloy | mixture of 2 or more elements, at least one is a metal |
| alkali metals | most reactive elements |
| MgBr2 | 2 tells you there are bromide ions for each magnesium ion |
| malleable | can be rolled into sheets |
| Na2S | Sodium Sulfide |
| subscript | small number written after an atomic symbol and just below it; tells how many of that element there are |
| coefficient | Large number written before a chemical formula telling how many of that compound you have |
