Number of valence electrons present in an atom A belongs to `3^(rd)` group and `3^(rd)` period is

The number of valence electrons in carbon atom is

What happens to number of valence electrons in atoms of elements as we go down a group of the periodic table ?

Number of orbitals present in 3rd shell is

Lithium (3) belongs to which group and period of periodic table.

The number of electrons present in the valence shell of a halogen is :

Metalloid in 3rd period.

What is the number of unpaired electrons present in the valency shell of group elements?

Element having atomic number 20 belongs to which group of periodic table.

Writen the atomic number of the element present in the fourth period and eighth group of the Modern periodic table.

Write the atomic number of the element present in the third period and seventeenth group of the periodic table.