Why are the electronic configuration numbers the way they are? 2,8,18,32 ...so on- how were they determined?

Question

Please right the answer for kids

11781 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-02-15T12:15:09

Bohr's Model.

As Niels Bohr suggested that electrons will Fill up the shells according to the principal quantum number.

So, for K shell, the principal quantum number( $n$ $n$ ) is 1.

So, maximum electrons which can fill the cells are $2 n^{2}$ $2n^2$ = $2 {(1)}^{2}$ $2(1)^2$ = $2$ $2$ .

For L shell, maximum electrons = $2 {(2)}^{2}$ $2(2)^2$ = $8$ $8$

For M shell, maximum electrons = $2 {(3)}^{2}$ $2(3)^2$ = $18$ $18$

For N shell, maximum electrons = $2 {(4)}^{2}$ $2(4)^2$ = $32$ $32$

And So On.

But this doesn't mean that electrons will fill up from K to L.

It depends upon Azimuthal Quantum Number and Aufbau Principle.

Hope this helps.