| A | B |
|---|
| Element | cannot be decomposed into two or more different substances |
| Elements that combine chemically | form new properties |
| Air | a mixture of gases |
| Compound | formed from the chemical union of two or more elements |
| Noble gases | do not react - called INERT |
| Periods | Horizontal rows on Periodic Table |
| Groups | vertical columns on Periodic Table |
| Elements with similar chemical properties | are located in the same group |
| Noble Gases | Group 18 |
| Halogens | Group 17 |
| Metals | Left side |
| Non-metals | Right side |
| Metalloids | Along the "staircase" |
| Same number of Valence electrons | result in similar properties |
| Nonmetallic solids | brittle and dull |
| Malleable | can be hammered into thin sheets |
| Ductile | can be drawn into thin wires |
| Mobile "sea of electrons" | result in luster and conductivity |
| Brittleness | shatters like glass |
