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8Sci CH 6

Combining Atoms and Bonds

ion positively or negatively charged atom of an element
covalent bond when two elements share an electron(s)
ionic bond an element looses or gains an electron(s) to create a bond between two elements
superscript above
subscript below
compound one or two elements joined to create a new substance
electron has negative charge; light weight
neutron has neutral charge and weighs one mass unit
protron has a positive charge and weighs one mass unit
element pure substance
atom smaller particle that makes up elements
valence electrons electrons found in outer energy level or shell of an atom
atomic number identifying number for each element on the periodic chart; the number of protons in the nucleus of an atom
mass number the weight of the number of protons and neutrons in the nucleus of an atom
noble gases most stable; least reactive
alkali metals least stable; most reactive
Created by: dhockett