Question

What is 2nsquare rule?

Answer 1

Answer:

it is used to find no

of electrons in a shell

Explanation:

ex.in first shell n=1 so no. of electrons =2(1)^2=2

Answer 2

it is for measuring no. of electron in shell of atom

suppose

K is first orbit

hence

no. of electron in K shell=2n^2

=2×(1)^2

=2

so by putting no. of shell in this formula you get no. of electron in that shell.