. The electronic configuration of an element 'X' is 2, 8, 8, 2. To which (a) period


The electronic configuration of an element 'X' is 2, 8, 8, 2. To which (a) period and (b) group of the modern periodic table does 'X' belong? State its valency. Justify your answer in each case

Best Answer

Element: 'X', Electronic configuration: 2, 8, 8, 2

 

(a) 'X' belongs to 4th period because 'X' has four energy shells and energy shell number corresponds to the period number.

 

(b) 'X' belong to 2nd group because 'X' has 2 electrons in its outermost shell and valence electrons (1, 2) corresponds to the group number of the element Valency

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