Which among the following elements of $3^{\text {nd }}$ period shows maximum tendency of forming $\mathrm{d}…
Which among the following elements of $3^{\text {nd }}$ period shows maximum tendency of forming $\mathrm{d} \pi-\mathrm{p} \pi$ bond ?
Chlorine
Silicon
Phosphorus
Sulphur
Solution
Among the given elements Cl has maximum tendency of $\mathrm{d} \pi-\mathrm{p} \pi$ bonding $\mathrm{On}$ moving across period, nuclear charge increases and more $s$, p-electrons are added. Due to incomplete shielding of nuclear charge, the atomic size and so the size of 3 d-orbitals decreaxes from $\mathrm{Si} < \mathrm{P} < \mathrm{S} < \mathrm{Cl}$ Decrease in size of 3 d-orbitals leads to stronger $d \pi-p \pi$ overlap.
,