An element X belongs to fourth period and fifteenth group of the periodic table. Which of the following statements is true-

Options

A. it has a completely filled s-orbital and a partially filled d-orbital
B. It has completely filled s-and p-orbital and a partly filled d-orbital
C. it has completely filled s-and p-orbitals and a half filled d-orbital.
D. it has a half-filled p-orbital and completely filled s-and d-orbital

Answer

D

Explanation

The element X is positioned at 4th perido and 15th group. Hence the element is As. (Atomic mass=33) electronic configuration of the element.
`1s^(2)2s^(2)2p^(6)3s^(2)2p^(6)3d^(10)4s^(2)4p^(3)`
thus the element has a half-filled p-orbital and a fully filled s-and a d-orbital.