| A | B |
|---|
| groups | columns in the periodic table |
| periods | rows in the periodic table |
| periodic table | table of elements arranged in atomic number order |
| ions | charge particles (atoms that have gained or lost electrons) |
| metals | form positive ions |
| non metals | form negative ions |
| noble gases | group 0: unreactive: have a full outer shell |
| alkali metals | group 1: reactive: have one outer electron |
| halogens | group 7: reactive: have 7 outer electrons |
| dot and cross diagram | represents the electrons in an ionic bond |
| giant structure | ionic compound with millions of ions in repeating pattern |
| electostatic forces | force of attraction between positive and negative ions in an ionic bond |
| lattice | regular arrangement of ions in repeating pattern |
| empirical formula | simplest ratio of atoms of each element in a compound |
