| A | B |
|---|
| Triad | Properties similar with elements three of group a |
| Law of octaves | masses atomic their of order in listed are elememts the when elements eight every appear properties same the |
| Periodic Law | numbers atomic their of function periodic a are elemts of properties the |
| Periodic Table | configurations electron and numbers atomic their upon based elements the of arrangement pictorial a |
| Transition element | sublevel d a in is electron energy highest whose element an |
| Lanthanoid series | sublevel 4f the in be to electrons energy highest the predicts diagram arrow the which in lanthanum with beginning elements fourteen |
| Actinoid series | sublevel 5f the in be to electrons energy highest the predicts diagram arrow the which in actinium with beginning elements fourteen |
| Period | table periodic the of row horizontial a |
| Group | table periodic the in column vertical a of elements the |
| Octet rule | level outer thi\eir in electrons eight acquire they that so electrons lose or gain to atoms of tendency the |
| Family | table periodic the of column vertical a composing elements the |
| Metal | reaction chemical in electrons lose to tends that element an |
| Nonmetal | reactions chemical in electrons gain to tends that elements an |
| Metalloid | nonmetal a and metal a of characteristic properties has that element an |
