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1. coordinate covalent bond: Forms when one atom donates a pair of electrons to be shared with an atom or ion that needs two electrons to become

2. covalent bond: a chemical bond that results from the sharing of valence electrons

3. endothermic: a chemical reactiodn in which a greateer amount of energy is required to break the existing bonds in the reactants than is realsed when teh new bonds form in the product molecules

4. exothermic: a chemical reaction in which more energy is released than is required to break bonds in the initial reaction

5. Lewis structure: a model that uses electron-dot structures to show how electrons are arranged in molecules. Pairs of dots or lines represent bonding pairs.

6. molecule: forms when two or more atoms covalently bond and is lower in potential energy than ists constituent atoms

7. polar covalent: a type of bond that forms when electrons are not shared equally

8. resonance: condition that occurs when more than one valid Lewis structure exists for the same molecule.

9. structural formula: a molecular model that uses symbols and bonds to show relative positions of atoms; can be predicted for many molecules by drawing the Lewis structure.

10. VSEPR model: Valence Shell Electron Pair Repulsion model, which is based on an arrangemnet that minimizes the repulsion of shared and unshared pairs of electrons arond the central atom.