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Science Vocab 5
Term | Definition |
---|---|
Periodic Table | an arrangement of elements in columns based on a set of properties that repeat from row to row |
Period | a row in a periodic table of elements |
group | a column of elements in a periodic table |
periodic law | the pattern of repeating properties displayed by elements in the periodic table |
Atomic mass unit | one twelfth the mass of a carbon -12 atom |
metals | elements that are good conductors of heat and electric currents |
transition metals | elements that form a bridge between 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 | The elements in Group 1A of the periodic table, not including hydrogen |
halogens | The elements in Group 7A of the periodic table |
noble gases | the elements in Group 8A of the periodic table |