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Andrew Masich
Chapter 5 vocab
Term | Definition |
---|---|
periodic table | an arrangement of elements in columns |
period | each row in the table of elements |
group | each column in the table |
periodic law | a pattern of repeating properties |
atomic mass unit | one twelfth the mass of a carbon 12 atom |
metals | elements thaat are good conductors of heat and electricity |
nonmetals | elements that are poor conductors of heat and electricity |
transition metals | elements on the left and right side of the periodic table |
metalloids | elements that have properties that fall between metals and nonmetals |
valence electron | an electron with the highest occupied energy level of an atom |
alkali metals | metals with one valence electron and highly reactive |
alkaline earth metals | elements in group 2a |
halogens | elements in group 7a with 7 valence electrons |
noble gasses | elements in group 8a all except helium, they have 8 valenc electrons |