| A | B |
|---|
| valence electron | The electrons that are in the highest energy level of an atom and that are involved in chemical reactions. |
| electron dot diagram | A representation of the valence electrons in an atom, using dots. |
| chemical bond | The force that holds atoms together. |
| ion | An atom or group of atoms that has become electrically charged. |
| polyatomic ion | An ion that is made of more than one atom. |
| ionic bond | The attraction between oppositely charged ions. |
| ionic compound | A compound that consists of positive and negative ions. |
| chemical formula | A combination of symbols that represents the elements in a compound and their proportions. |
| subscript | A number in chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound. |
| crystal | An orderly, three-dimensional pattern of ions or atoms in a solid. |
| covalent bond | A chemical bond formed when two atoms share electrons. |
| molecule | A neutral particle made of two or more atoms joined by covalent bonds. |
| double bond | A chemical bond formed when atoms share two pairs of electrons. |
| triple bond | A chemical bond formed when atoms share three pairs of electrons. |
| molecular compound | A compound that is composed of molecules. |
| polar bond | A covalent bond in which electrons are shared unequally. |
| nonpolar bond | A covalent bond in which electrons are shared equally. |
