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Chapter5Vocab
Chapter5VocabWords
Term | Definition |
---|---|
Periodic Table | An arrangement of elements in columns, based on a set of properties that repeat from row to row. |
Period | Each row in the Periodic table is named this |
Group | Each column in the Periodic table is named this |
Periodic Law | The pattern of repeating properties |
Atomic Mass Unit (AMU) | Defined as one-twelfth 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 Periodic 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 | These metals have a single valence electron and are extremely reactive. Group 1A |
Alkaline Earth Metals | These metals have two valence electrons. Group 2A |
Halogens | Each of these has 7 valence electrons. Group 7A |
Noble Gases | All of these elements contains 8 valence electrons except for Helium. Group 8A |