Composition of atoms of the first twenty elements with electron distribution in various shells
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when we go down a group the atomic radius increase and electroposivity increase.
when we from left to right the radius of the atomic decrease because of the nuclear charge by nucleus.
when we from left to right the radius of the atomic decrease because of the nuclear charge by nucleus.
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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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