Question

What is helium's electron configuration?

Answer 1

`1s^2`

Explanation:

Helium has an atomic number of two which means it has 2 protons. A neutral He atom will also have 2 electrons.

Here is a review of determining the number of subatomic particles in an atom.

In its ground state, helium will have two electrons in the first energy level. These electrons are found in the 1s sublevel.

Here is a video which discusses how to write electron configurations.

Hope this helps!