Question

taking the example of an element of atomic number 16. explain how the electronic configuration of the atom of an element relates to it's postion in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.

Answer 1

the element with atomic no. 16

first what to do is its electronic configuration
K L M
2 8 6
or 1s2 2s2 2p6 3s2 3p4
the configuration lasts with p so it is in p block in periodic table


valency = 8 - 6 =2