Question

What is the electronic configuration of Scandium? Is the electronic configuration of elements after atomic number 20 different ,do they follow spdfconfigurations,or do they also accord 2n² formula?

Answer 1

The electronic configuration of elements after 20 is not different. We can also write the configuration of those elements in terms of K, L, M shells. Scandium has atomic number 21. The electronic configuration is 2, 8, 8, 3. Here the M shell can not accommodate more than 8 electrons as if it will accommodate 11 electrons then it will violate the one rule for the electronic configuration i.e., the valence shell can not have more than 8 electrons.
In terms of s,p,d,f the configuration will be 1s²2s²2p⁶3s²3p⁶3d¹4s².