Question

summarise the rules of writing symbols of element​

Answer 1

Answer:

All of these 118 elements on the periodic table have chemical symbols represented by the first letter or two of the name of the element. If the chemical symbol has two letters the first letter is always capitalized and the second letter is written in lowercase.

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Answer 2

Question :-

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

Answer :-

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

(i) The maximum number of electrons present in a shell is given by the formula-2 n2

∵ n = orbit number i.e., 1, 2, 3

∵ Maximum number of electrons in different shells are:

K shell n = 1 2n2 => 2(1)2 = 2

L shell n = 2 2n2 => 2(2)2 = 8

M shell n = 3 2n2 => 2(3)2 = 18

N shell n = 4 2n2 => 2(4)2 = 32

(ii) The maximum number of electrons that can be accommodated in the outermost orbit is 8.

(iii) Electrons are not accommodated in a given shell unless the inner shells are filled. (Shells are filled step-wise).

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