Question

What is the atomic number of the element which has $3d^6$ as its outermost configuration?

• A. $12$
• B. $32$
• C. $26$
• D. $24$

Answer 1

Answer: (C)

An element with $3d^6$ configuration should have all the inner orbitals filled.
Thus the complete electronic configuration will become:
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^6$
total number of electrons are: $2+2+6+2+6+2+6=26$
thus atomic number of the element with $3d^6$ outer configuration is 26 .