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8Sci CH 6
Combining Atoms and Bonds
Term | Definition |
---|---|
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 |