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Vocab Chapter 5

TermDefinition
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; the time required for one complete cycle of a periodic motion; a unit of geologic time into which geologists divide eras.
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 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 pf 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.
alkaline earth metals the elements in Group 2A of the periodic table.
halogens the elements in Groups 7A of the periodic table.
noble gases the elements in Group 8A of the periodic table.
Created by: alexis.pastva
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