Question

Two elements have electronic configuration of 2, 8, 2 and 2, 8, 7 respectively. Infer to which period of the periodic table they belong​

Answer 1

Answer:

ANSWER

Element 'X' is sulphur(2,8,6)

Thus, it's atomic number will be =2+8+6=16

Thus the element is Si

It belongs to p-block of periodic table.

Its electronic configuration can also be written as [Ne]3s 2

3p  

4

 

Thus it belongs to 3  

rd

 period

Group number =16

Its valency will be 8−6=2

Explanation:

Answer 2

Answer:

3rd period

element with E.F. 2,8,2 is (Mg)

element with E.F. 2,8,7 is (Cl)