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Mary Russell
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 | 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 (amu) | one twelfth of the mass of a carbon-12 atom |
metals | elements that are good conductors of heat and electric current |
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 |
alkaline earth metals | the elements in group 2A of the periodic table |
halogens | the elements in group in 7A of the periodic table |
noble gasses | the elements in group 8A of the periodic table |
alali metals | the elements in group 1A |