Question

1. Determine the following for (a) PF3 and (b) BrF4 Complete Lewis Dot Structure (all bonding and non-bonding electrons) (a) :F: PEF (b) Number of electron groups around the central atom (a) (b) → Electron Group Geometry (the shape corresponding to the arrangement of th electron groups) (b) Number of bonding/non-bonding groups around the central atom (a) (b) → Molecular Geometry (Molecular Shape) (a) (b) Is the molecule polar? Explain your choice (use the arrangement of the dipoles, i any, to explain your choice) (a) (b)

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Answer 1

Lewis structure (a) PF3 (b) BrF4+ :F- Br—F : :F: Number of electron group around central atom (a) _Total valence electron +No.of univalent Echarge Electron pair = Electron pair= 5+3=0 Electron pair= 4 electron group around central atom (b) _Total valence electron +No.of univalent Echarge Electron pair = Electron pair='+4-- Electron pair= 5 electron group around central atom Electron group geometry (a) Electron pair= 4 Sp3 hybridisation Tetrahydral

16) Electron pair= 5 Sp3d hybridisation Trigonal bipyramidal No. of bonding/non-bonding group around central atom Total electron pair electron = no. of bonding e + no. non bonding electron (a) Total Electron pair= 4 3 bond = 3 bonding pair So, non bonding = 1 (a) Total Electron pair= 5 4 bond = 4 bonding pair So, non bonding = 1 Molecular shape (a) trigonal pyramidal

(b) K shape : Br F Polarity (a) Polar Polar