Question

State the electronic configuration for Helium [$p=2,n=2$].

• A. $1$
• B. $3,2$
• C. $2$
• D. $2,4$

Answer 1

The correct option is C $2$

As we know, atomic number is the total no of proton present in nucleus of an atom and atomic mass number is the total no of proton and neutron. So, He have atomic no. $2$ and mass no. $4$. The electronic configuration of He is $2$