. Taking the example of an element of atomic number 16 explain how the electronic configuration of the atom of an element relates

to its position in the modem periodic table and how valency of an element is calculated on the basis of its atomic number. 


Best Answer

Ans. Atomic number of the element= 16

Electronic configuration =    K L M

                                      2 8, 6

Since this element has 3 shells, the period number will be 3 as period number  is equal to the .number  of shells that start filling up in it.

No. of valence electrons = 6 :.  The group number will be 10 + 6 = 16

The valency of an element is determined by the number of valence electrons present in the outermost shell.

Valency of the element will be = 8 - valence electrons = 8 - 6 = 2


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