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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 |