Easy Practice — Set 2

Quick Recap — Geometry, MOT & Polarity

• VSEPR shapes: $BF_3$ trigonal planar, $PCl_5$ trigonal bipyramidal, $SF_6$ octahedral, $NH_3$ pyramidal, $H_2O$ bent.
• MOT bond order $=\dfrac{N_b-N_a}{2}$; $N_2$ (3, diamagnetic), $O_2$ (2, paramagnetic), $F_2$ (1). Higher bond order $\to$ shorter, stronger bond.
• Dipole moment is a vector sum of bond dipoles; symmetric molecules ($CO_2$, $BF_3$, $CCl_4$) are non-polar.
• Fajans' rules: small cation, large anion and high charge favour covalent character.