2. Ions Ion – Charged Atom Cation - positive charged atom Anion negative charged atom Charge equals the A group number

3. Poly atomic Ion - Charged particle formed by a group of covalently bonded atoms.

4. Formulas Molecular Formula – exact number and type of atoms present Empirical Formula – Simplest whole number ratio of atoms present in a molecule or compound.

5. Valence Electrons The number of electrons in the outer level of an atom. Equals the A group number

8. Ionic Bond bond formed by the giving or taking of electrons

10. Properties of Ionic Compounds Formed from a metal and a non metal Most are soluble in water Form crystalline lattices

11. Covalent Bond bond formed by the Sharing of electrons

13. Properties of Covalent Compounds Formed by two nonmetals Solubility varies The strongest bond

14. Polarity Slight charge differences in a molecule due to atoms having different electronegativity

15. Electronegativity The attraction an atom has for a pair of shared electrons

16. More Electronegative

18. Polar Covalent Bond Bond formed with unequal sharing of electrons

22. Bond lengths The distance between the nuclei of two covalently bonded atom.