Ionic Bonds

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An is an atom or group of atoms that has become electrically . When an atom loses an , it loses a negative charge and becomes a positive . When an atom gains an electron, it gains a charge and becomes a negative .

Forming an Ionic Bond:
Follow what happens to sodium and chlorine atoms. The transfer of sodium's one valence to chlorine changes both atoms into . The sodium atom becomes a ion (Na+) The chlorine atom becomes a ion (Cl-). Negative and electric charges attract each other, so the oppositely charged Na+ and Cl- come together. They form sodium chloride, which you know as table salt.
An ionic is the attraction between two oppositely charged . This attraction is similar to the attraction between opposite poles of a magnet. When the two come together, the opposite charges cancel out. Every sodium (with a charge written as 1+) is balanced by a chloride (with a charge written as 1-). The formula for sodium chloride, NaCl, shows you this 1:1 ratio.