Match the following terms and definitions. 1. electrically charged atom or group of atoms formed by the loss or gain of electrons chemical bond 2. the union between atoms by the interaction of their electrons in the outermost orbit ionic bond 3. atoms of elements or compounds interact to form at least one new compound 1 ion 4. the number of electrons lost or gained to complete an element's outer shell valence 5. a bond formed by the electrical attraction between two oppositely charged ions chemical reaction