An element $(\mathrm{X})$ forms compounds of the formula $\mathrm{XCl}_{3}, \mathrm{X}_{2} \mathrm{O}_{5}$ and $\mathrm{Ca}_{3} \mathrm{X}_{2}$ but does not form $\mathrm{XCl}_{5}$.
Which of the following is the element $X ?$

Question

Aicharya · Accepted Answer

Nitrogen can form $\mathrm{NCl}_{3}, \mathrm{~N}_{2} \mathrm{O}_{5} \mathrm{Ca}_{3} \mathrm{~N}_{2}$ and not $\mathrm{NCl}_{5}$ since it has no $\mathrm{d}$ atomic orbitals in valence shell

An element $(\mathrm{X})$ forms compounds of the formula $\mathrm{XCl}_{3}, \mathrm{X}_{2} \mathrm{O}_{5}$…

Solution