Question

Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.

Answer 1

Rules
shells are filled by very interesting method that is according to their energy
shell having lower energy will fill first
energy is calculated by adding their shell+ subshell number
to remember this you can write
them as
1s
2s 2p
3s 3p 3d
and so on
and cut diagonally each row the number which is cut first is filled first

Answer 2

_/\_Hello mate__here is your answer--

_______________________

The rules for writing of the distribution of electrons in various shells for the first eighteen elements are given below:

(1) The maximum number of electrons that a shell can hold is given by the formula '2n^2', where 'n' is the orbit number or energy level index (n = 1, 2, 3...).

The maximum number of electrons present in an orbit of n = 1 given by 2n^2 = 2 × 1^2 = 2 Similarly, for second orbit, it is 2n^2 = 2 × 2^2 = 8 For third orbit, it is 2n^2 = 2 × 3^2 = 18 And so on .....

(2) The outermost orbit can be hold by a maximum number of 8 electrons.

(3) Shells are filled with electrons in a step wise manner i.e., the outer shell is not occupied with electrons unless the inner shells are completely filled with electrons.

I hope, this will help you.☺

Thank you______❤

_________________________❤