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Macy Debevec
chapter 5 vocabulary
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 table of elements |
group | Each column on the periodic table |
periodic law | pattern of repeating properties |
atomic mass unit (amu) | Defined as one twelfth 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 |
non metals | 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 |