Question

The electronic configuration of an element is $1s^2,2s^2,2p^6,3s^{2}3p^3$. What is the atomic number of the element which is just below the given element in the periodic table?

• A. $34$
• B. $49$
• C. $33$
• D. $31$

Answer 1

The correct option is C $33$

The element with the given electronic configuration is P (Phosphorus) and the atomic number is 15 below this is atomic number 33 As (Arsenic).

The electronic configuration of the Arsenic is given as follow:

$\left[Ar\right]3d^{10}4s^{2}4p^3$