| A | B |
|---|
| ALKALI METALS | GROUP 1 |
| ACTINIDES | ELEMENTS 90 -103 OR 5f'S |
| LANTHAIDES | ELEMENTS 58 - 71 OR 4f'S |
| ALKALINE | GROUP 2 |
| HALOGENS | GROUP 17 |
| NOBLE GASAS | GROUP 18 |
| METALS | LOSE ELECTRONS FORM CATIONS |
| NONMETALS | GAIN ELECTRONS FORM ANIONS |
| ANION | NEGATIVE ION |
| CATION | POSITIVE ION |
| TRANSITIONAL METALS | d BLOCK |
| INNER TRANSITIONAL | f BLOCK |
| OXIDATION NUMBER | THE CHARGE THAT RESULTS WHEN AN ATOM GAINS OR LOSES ELECTRONS WHEN FORMING BONDS |
| FIRST IONIZATION POTENTIAL | ENERGY REQUIRED TO REMOVE THE MOST LOSELY HELD ELECTRON FROM AN ATOM |
| ELECTRON AFFINITY | THE ENERGY RELEASED WHEN AN ATOM IN THE GAS STATE GAINS AN ELECTRON |
| VALENCE ELECTRONS | ELECTRONS IN OUTER ENERGY LEVEL |
| GROUP/FAMILY | VERTICAL COLUMNS HAVE SIMILAR PROPERTIES |
| PERIOD | HORIZONTAL ROWS ELEMENTS IN SAME PERIOD HAVE SAME NUMBER OF ENERGY LEVELS |
| ION | CHARGED ATOM OR GROUPS OF ATOMS |
| ELECTRON SHIELDING | THE REPULSION OF OUTER ELECTRONS BY INNER ELECTRONS REDUCING THE ABILITY OF THE NUCLEOUS TO ATTRACT OUTER ENERGY LEVEL ELECTRONS |
