What is the total number of Inert elements of the modern periodic table?
6
5
7
4
6 Elements - He, Ne, Ar, Kr, Xe, Rn.
What is the number of elements in the 1st and 3rd period of the modern periodic table ?
If an element with atomic number 'Z' is an inert gas. In which group would you place an element with atomic number (Z + 2) in the modern periodic table?
What is the number of elements in the :
(a) Ist period, and
(b) 3rd period, of the modern periodic table ?