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Emily Barnett

Chapter 5 vocabulary

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 atoms.
Metals elements that are good conductors of heat and electric current.
transition metals elements that form a bridge between elements on the left and the 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 A1 of the periodic table, not including hydrogen.
alkaline earth metals the elements in group A2 of the periodic table.
halogens the elements in group 7A of the periodic table
noble gases the elements in group 8A of the periodic table.
Created by: emily.barnett
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