Atomic numbers of some elements are "31,34,49,50,53,81,84" and "85." Number of elements in \(5^{th}\) period is

Number of elements present in 5th period is

Total number of elements in 6th period are:

Atomic number of a few elements are given below 10, 20, 7, 14 Identify the Group number of these elements in the Periodic Table.

Atomic number of a few elements are given below 10, 20, 7, 14 Identify the Periods of these elements in the Periodic Table.

The number of elements in the 4th period of periodic table is

The atomic number of an element is 35 and mass number is 81.The number of electrons in the outer most shell is

An element 'E' has atomic number 14. To which period this element belongs? How many number of elements are present in the period to which element ' E' belongs?