Question

11. Helium atom has------
stable configuration​

Answer 1

Answer:

1s subshell can accommodate a maximum of 2 electrons. So, the electronic configuration of the Helium atom is 1s2. ... Whereas halogens and chalcogens are 1 and 2 electrons short of their fulfilled valence shell respectively so they try to attain these electrons and attain a stable configuration.

Answer 2

Explanation:

Helium atoms, on the other hand, have two protons and two electrons in the lowest energy level. The lowest energy level is filled with its maximum number of electrons. This is a very stable arrangement, and helium in consequence is an inert gas with few chemical properties.