Chemical Bonding: Ionic & Covalent Bonds (1 of 3)

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Ion—atoms that have a charge (+ or -).
Lost electron = + charge = cation.
Gained electron = - charge = anion.

Octet—an atom has an octet when its highest energy level is full. All noble gases have octets.

To find the number of valence electrons for an atom, use your periodic table. Here's how.

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