Write the orbitals in which "18" elements present in the "5" th period "

Number of elements present in 5th period is

The number of elements present in the fourth period is

The number of element present in the fifth period is

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

If 3e^(-) can be accomodated in each orbital then how many elements will be present in the 7th period of periodic table?

The total number of inner transition elements present in the 7th period are _________.

Write the electronic configuration of the element present in the third period and seventeenth group of the periodic table.