Question

Taking an example of an element of atomic number 16 explain how the electronic configuration of the atom of an element related to its position in the modern periodic table and how valency of all elements is calculated on the basis of its atomic number

Answer 1

The element with atomic no. 16 is S (Sulphur)

The elctronic configuration of an element is related to its position in the modern periodic table as the no. Of atomic orbitals increases across the period and decreases down the group.

Valency on the basis of atomic no. Can be calculated on the basis of its atomic no. By differentiating the value of atomic no. into 2,8,8. Elements whose valence Shell’s have >4 electrons are non-metals (negative valency) and those whose valence shells have <4 electrons are metals (positive valency) e.g., for Sulphur, atomic no.=16, valency = 2,8,6 = -2.

Answer 2

Example atomic no.16
electronic configuration=1s^2 2s^2 2p^6 3s^2 3p^4
always remember that valence shell represents the group no. and the no. of electrons in these valance shell represents period no.
In this case the group no. is 3
and the period is 6 and using this electronic configuration you can find the position.

Example atomic no. 16
the valence shell of atomic no. 16 is 3s^2 3p^4
This is how you can find the valence shell electronic configuration with help of atomic no. of elements

This is the answer of your question!!!!!