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Chapter 5
elements
| Term | Definition |
|---|---|
| Periodic Table | Is an arrangement of elements in columns , based on a set of properties that repeat from row to row. |
| Period | Each row in the table of elements. |
| Group | Each column on the periodic table. |
| Periodic Law | Pattern of repeating properties. |
| Atomic Mass Unit | Is defined as one twelfth the mass of a carbon-12 atom. |
| Metals | Elements that are goof conductors of electric current and heat |
| Transition metals | Elements that form a bridge between the elements of the on the left and right sides of the table. |
| Nonmetals | Elements that are poor conductors of heat and electric current. |
| Metalloids | Elements with properties that fall between those of metals and nonmetals. |
| Valence Electron | An electron that is in the highest occupied energy level of an atom. |
| Aklali Metals | The elements in group 1A |
| Akali Earth Metals | The elements in group 2A |
| Halogens | The elements in group 7A |
| Noble Gases | The elements in group 8A |