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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 covalent bond a chemical bond that results from the sharing of valence electrons 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 exothermic a chemical reaction in which more energy is released than is required to break bonds in the initial reaction 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. molecule forms when two or more atoms covalently bond and is lower in potential energy than ists constituent atoms polar covalent a type of bond that forms when electrons are not shared equally resonance condition that occurs when more than one valid Lewis structure exists for the same molecule. 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. 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.