positive or negative number that indicates how many electrons an atom has gained, lost, or shared to become stable

a number written immediately above and to the right of the checmical’s symbol;

a compound that is composed of two elements

force that holds atoms together in a compound

the force of attraction between the opposite charges of an ion in an ionic compound (metal and nonmetal)

a chemical bond that involves sharing a pair of electrons between atoms in a molecule (only nonmetal)

the process of adding electrons to or removing electrons from an atom or group of atoms

a combination of different substances that remain the same individual substances and can be separated by physical means

a pure substance that is made of two or more different types of atoms bonded together and can only be separated by chemical means.

 a neutral particle that forms as a result of electron sharing among atoms

substances that are made of only one type of atom or only one type of molecule (a group of atoms bonded together)

a pure substance that contains only a single type of atom and cannot be broken down into a simpler type of matter by either physical or chemical means