An element (X) forms compounds of the formula XCl3, X2O5 and Ca3X2 but does not form XCl5. Which of the following is the element X ?
(a) B
(b) Al
(c) N
(d) P
Correct option: (c) N
Explanation:
Nitrogen can form NCl3, N2O5 Ca3N2 and not NCl5 since it has no d atomic orbitals in valence shell.
