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Unformatted text preview: electrons becomes positively charged and the atom that gains one or more electrons becomes negatively charged. These charged particles are called ions . Positively charged ions are cations . Negatively charged ions are anions . Ions have a charge and are written with a plus (+) or a minus (-) sign. For example, calcium loses two electrons to form a calcium ion. The chemical symbol for a calcium ion is therefore Ca ++ or Ca +2 . The ions in a compound are attracted to each other due to opposite charges. The attraction is called an ionic bond . The electrical attraction between sodium ions (+) and chloride ions (-) produces the regular arrangement diagramed below. The crystalline structure of sodium chloride discussed above can be seen in the photograph below. Ionic bonds are weak and the ions can be separated in water (discussed later)....
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- Fall '10