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Chemistry Review 021511 wo pics

Chemistry Review 021511 wo pics - MOLECULAR BONDING Based...

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1 C HEMISTRY R EVIEW Lia M. Nightingale, Ph.D. M OLECULAR B ONDING Based on valence electrons and electronegativity Valence electrons e - in outermost shell Ca F F F Ca + Bonded pair Unshared pair Unpaired e - Ca F F Ca F F OR M OLECULAR B ONDING Electronegativity how easily an element can accept electrons M OLECULAR B ONDING In a molecule: Higher electronegativity = e - acceptor Lower electronegativity = e - donator Electronegativity difference ( Δ EN) = Highest # lowest # Ca F F Ca = 1.0 F = 4.0 Δ EN = 3.0 M OLECULAR B ONDING Δ EN Bond Type 0 0.4 Nonpolar Covalent 0.41 1.7 Polar Covalent 1.8 Ionic Electrons shared equally δ + δ - Electrons shared inequally + - Electrons transferred M OLECULAR B ONDING Nonpolar covalent bonds Hydrophobic C H H H H H = 2.1 C = 2.5 Δ EN = 0.4
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