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How does the electronic configuration of...

How does the electronic configuration of an atom related to its position in the modern periodic table ?

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(i) The group number of elements having up to two valence electrons is equal to the number of valence electrons.
(ii) The group number of elements having more than two valence electrons is equal to the number of valence electrons plus 10.

(iii) For those elements, which do not have the same number of valence electrons but same number of shells, the number of shells is equal to the period number to which they belong in the periodic table. For example :
`2^(nd)` Period :
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