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Ions
• Ion – Charged Atom
• Cation - positive charged atom
• Anion negative charged atom
• Charge equals the A group number
Formulas
• Molecular Formula – exact number and type of atoms present
• Empirical Formula – Simplest whole number ratio of atoms present in a molecule or compound.
Valence Electrons
• The number of electrons in the outer level of an atom. Equals the A group number
Properties of Ionic Compounds
Formed from a metal and a non metal
Most are soluble in water
Form crystalline lattices