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9Sci CH11

9th Science CH11 Chemical Bonds

TermDefinition
binary compound a chemical compound composed of two elements;; for example sodium chloride
chemical bond the force that holds together the atoms in a compound; chemical bonding occurs because atoms because atoms of most elements become more stable by losing, gaining and sharing electrons
chemical formula a precise statement that tells which elements are in a compound and their ratios
chemically stable describes an atom whose outer energy level is completely filled with electrons
corrosive hazardous compound that attacks and alters metals, human tissue, or other materials; for example, oven cleaners and battery acid
covalent bond a type of chemical bond formed by atoms when they share electrons; covalent bonding produces molecules
hydrate a compound that has water molecules chemically attached to its ions and written into its formula
ion a positively or negatively charged atom
ionic bond a type of chemical bond formed by the attraction between opposite charges of the ions in an ionic compound
nonpolar molecule a molecule that does not have oppositely charged ends
oxidation number a positive or negative number that indicates how many electrons an atom has lost, gained, or shared when bonding with other atoms
polar molecule a molecule with opposite charges on each end
polyatomic ion a group of covalently bonded atoms in which the whole group is positively or negatively charged
toxic hazardous substance that can injure living tissue; toxic compounds are poisonous