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chapter 5 vocab
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 is a period |
group | each column on the periodic table is a group |
periodic law | repeating properties |
amu | is defined as one twelfth of the mass of a carbon 12 atom |
metals | are elements that are good conductors of heat and electric current |
transition metals | are elements that form a bridge between the elements on the left and right side of the table |
nonmetals | are elements that are poor conductors of heat heat and electric current |
matalloids | are elements with properties that fall between those of metals and nonmetals |
valence electron | is an electron that is in the highest occupied energy level of an atom |
alkali metals | elements in group 1a |
alkaline earth metals | elements in group 2a |
halogens | elements in group 7a |
noble gases | elements in group 8a |