The number of elements present in the fourth period is

The number of element present in the fifth period is

The number of element present in the fifth period is

The number of elements present in the fifth period of the periodic table is

The number of elements present in the longest period is _________.

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

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

The number of elements present in both fourth and fifth period is ________.

Mention the number of elements present in each of the periods in the long form of table?

Number of elements present in the shortest period.