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Chapter 5 Vocab
Term | Definition |
---|---|
Periodic Table | An arrangement of the elements in columns, based on a set of properties that repeat from row to row |
Period | Each row of the periodic table |
Group | Each column on the periodic table |
Periodic Law | Properties of elements repeated in a predictable way when atomic numbers are used to arrange elements into groups |
Atomic Mass Unit (AMU) | 1/12 the mass of a carbon-12 atom |
Metals | Elements that are good conductors of electric current and heat |
Transition Metals | Elements that form a bridge between the elements 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 |
Alkali Metals | The elements in Group 1A |
Alkaline Earth Metals | The elements in Group 2A |
Halogens | The elements in Group 7A |
Noble Gases | The elements in Group 8A |