[" 21.What is the maximum number of elements if the elements above "n=4" do not exist in "],[" nature? "]

What is the maximum number of elements if the electrons above n = 4 do not exist in nature ?

What is the maximum number of elements if the electrons above n = 4 do not exist in nature ?

The maximum number of elements in third period is

The maximum number of elements available in elemental form

What is the rarest natural element in the earth?

What is total number of Natural Element?

What is the valency of an element if that element is in the group V or above ?

What is the maximum number of element that can be presents in a. 2d orbitals b. All the orbitals with n = 3