The shapes of $BCl_3, PCl_3$ and $ICl_3$ molecules are all

Which of the following molecules is theoretically not possible?

Determine the correct $(T)$ and incorrect $(F)$ statements for the permanganate ion $(MnO_4^-)$:
$(a)$ $MnO_4^-$ contains $\sigma$ bonds.
$(b)$ $MnO_4^-$ contains $\pi$ bonds.
$(c)$ $MnO_4^-$ contains both $\sigma$ and $\pi$ bonds.
$(d)$ $MnO_4^-$ is paramagnetic.

Which of the following facts is directly explained by the statement '$O$ is a smaller atom than $S$?'

Explain the formation of a chemical bond.

Identify the pair that is not isostructural.