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Q.
What is the atomic number of the element which has $3d^6$ as its outermost configuration?
Structure of Atom
Solution:
An element with $3 d ^{6}$ configuration should have all the inner orbitals filled.
Thus the complete electronic configuration will become:
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{6}$
total number of electrons are: $2+2+6+2+6+2+6=26$
thus atomic number of the element with $3 d ^{6}$ outer configuration is 26 .