Which period of the periodic table contains maximum number of elements?

Which group of the periodic table contains maximum elements

Which group of the periodic table contains maximum elements?

Third peroid of th periodic table contains the following number of elements.

The element of 4th period of the periodic table having maximum number of unpaired electrons in its ground state is

The element of 4th period of the periodic table having maximum number of unpaired electrons in its ground state is

The element A has atomic number 15. To which period of the periodic table the element belongs?

In the long form of periodic table __________ group contains the maximum number of elements.

Why the third period of Modern periodic table contains 8 elements and not 18 ?