| A | B |
|---|
| family | vertical column |
| period | horizontal row |
| alkali metal | column IA forms acids |
| alkaline earth | column IIA forms bases |
| halogen | column VIIA forms salts |
| noble gas | column VIIIA non-reactive |
| metal | to the left of the stairs; are lusterous, ductile, malleable, pliable |
| nonmetal | to the right of the staircase; are dull, brittle, and nonconductors |
| metalloid/semi-metal | on the staricase have characteristics of metals and non-metals |
| scarce | rare (noble gases) |
| inert | cannot form compounds (noble gases) |
| luster | shiny (metals) |
| ductile | can be tristed into wires (metals) |
| malleable | can be flattened into sheets (metals) |
| atomic radius | larger are on the bottom and to the left |
| pliable | flexible |
| transition elements/atoms | in the middle because their reactions vary with surroundings |
