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approximate bond angle(s), (b) the . hybridization. around the underlined atom. (Note: It is helpful to first sketch the Lewis stucture!) Molecule or Ion . Author: Colour chart. View PDF (1.4 MB) Temporarily available for download only. Matt. Colours with a matt finish for your home roofing, walling, and gutters. View PDF (2.5 MB) Therefore the geometry is based upon a trigonal-planar arrangement of electron pairs. Since the lone-pair orbital is only half filled, it demands less space, and the O-N-O angle opens out a little (to 134.1°) from the ideal trigonal angle of 120°. Addition of one electron to NO 2 gives the nitrite anion NO 2-. This last electron completes the ...