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Unformatted text preview: with different EN values • nonpolar covalent: equal sharing of electrons by two atoms with equal EN metallic bond: metals exist as nuclei in a sea of electrons; delocalized electrons hold nuclei together metals unique properties bond length: distance between nuclei of 2 bonded atoms – shorter the bond, the stronger the bond – single bonds are the longest and weakest – double bonds are shorter and stronger – triple bonds are the shortest and strongest Draw Lewis Structure for Molecules & Polyatomic Ions – octet rule: atoms bond such that each has 8 electrons, except H only needs 2 es. – H and F only form single bonds. Exceptions to the Octet Rule – Incomplete octet: Be can have 4 e–s, B can have 6 e–s, and N can have an 7 e–s – Elements in the third period and lower can have an expanded octet (>8 electrons) resonance structures: two or more structures representing a single molecule that has delocalized electrons and cannot be described fully with only one Lewis structure – Recognize which molecules require resonance structures by drawing Lewis structures for given examples. – Determine the formal charge for atoms in molecules requiring resonance structures. Lewis structures for ternary oxyacids – Oxygens b...
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