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8Sci CH6

8th Science CH6 Combining Atoms

balanced chemical equation equation with the same number of atoms of each element on both sides of the equation; whole-number coefficients can be written to balance a chemical equation
binary compound compound made up of atoms of two elements
covalent bond a type of bond formed between atoms when they share electrons; covalent bonds are strong and chemically stable
ion positively or negatively charged atom whose charge results from the gain or loss of one or more electrons; the more electrons an atom gains or loses, the higher its charge
ionic bond type of bond formed by the attraction of positively charged ions for negatively charged ions; ionic bonds hold ionic compounds together
molecule neutral particles formed when electrons are shared by atoms rather than being gained or lost
nonpolar molecule molecule with balanced charges whose electrons are shared equally, nonpolar molecules are not water soluble
oxidation number number of electrons that an atom gains, loses, or shares when bonding with another atom; some elements have more than one oxidation number
polar molecule molecule with unbalanced charges as a result of electrons being shared unequally
polyatomic ion ammonium, nitrate, and phosphate are examples of polyatomic ions--all of which are made up of a group of positively or negatively charged covalently bonded atoms