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Unformatted text preview: -3D shapes: entirely based on v alence s hell e- p air r epulsion (VSEPR)-VSEPR theory focuses on central atoms-maximizes distances b/w e- pairs (minimize repulsion)-uses e- frameworks-count # of e- regions-spread out equivalently (radially) around central atom-if n=2:-X – A – X-name = linear, angle = 180-ex: CO2-if n=3-name = trigonal planar, angle = 120-ex: COH2 = formaldehyde-if n=4-3D – tripod base with one standing up- triangle: further forward atom – base (right) = forward, point (left) = away-parallel lines creating a triangle: further back atom-ex: CH4-very common: perfect octet-tetrahedral-angle: 109.5-if n=5-flat triangle (on its side), one straight up, one straight down-expanded A (central atom)-ex: PCl5-trigonal bipyramid...
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