Question

why the electronic configuration of calcium is 2,8,8,2 but not 2,8,10​

Answer 1

Answer:

This is because -

Explanation:

It is because of this order (in which the atomic orbitals are filled) that the electronic configuration of of calcium is 2, 8, 8, 2 and not 2, 8, 9, 1 or 2, 8, 10. The rule that the valence shell cannot hold more than 8 electrons will also become clearer once you become familiar with the concept of subshells and orbitals.