Question

An atom of an element whose first shell is completed and has no other shell or orbit and the atom is

Answer 1

Answer:

Helium

Explanation:

The first shell can only have 2 electrons. Thus, the element should have 2 electrons. If there are more than 2 electrons, the electrons will go to the next shell. Thus, the element must have only 2 electrons.

An element which has only 2 electrons (in neutral state) is Helium.