Question

An element ‘X’ belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of ‘X’?

• A. It has partially filled d – orbitals and completely filled s – orbitals.
• B. It has completely filled s – orbitals and completely filled P – orbitals.
• C. It has completely filled s – orbitals and half – filled p – orbitals.
• D. It has half – filled d – orbitals and completely filled s – orbitals.

Answer 1

Answer: (C)

It has completely filled s – orbitals and half – filled p

– orbitals.

Answer 2

: The electronic configuration of ‘X’ can be written as

$X = 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{3}$

So, element ‘X’ has completely filled s- and d- orbitals and half – filled p – orbitals.