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AHS Chem B - Test 1

Nomenclature Unit Vocabulary Words

TermDefinition
percent composition The percent by mass of each element in a compound.
empirical formula A formula with the lowest whole-number ratio of elements in a compound.
molar mass A general expression used to refer to the mass of a mole of any substance.
ionic compound Compound composed of positive and negative ions.
molecular compound Compound composed of molecules.
monatomic ion A single atom with a positive or negative charge as a result of losing or gaining valence electrons.
polyatomic ion A tightly bound group of atoms that behaves as a unit and carries a charge.
anion Any atom or group of atoms with a negative charge.
cation Any atom or group of atoms with a positive charge.
ion An atom or group of atoms that has a positive or negative charge.
binary compound A compound composed of two elements.
chemical formula Shows the number and type of atoms present in the smallest representative unit of a substance. (Ex: NH3)
ternary compound A compound containing atoms of three different elements, usually containing at least one polyatomic ion. (Ex: Na2CO3)
anion Fluorine with a -1 charge (anion or cation?)
cation Beryllium with a +2 charge (anion or cation?)
monatomic ion Phosphorus with a -3 charge (monatomic ion or polyatomic ion?)
polyatomic ion (PO4) with a -3 charge (monatomic ion or polyatomic ion?)
Created by: krollj