20 points and will mark as brainliest if explained

how many different values for the principal quantum number must be used to describe all three electrons in a neutral atom of lithium?

3
1
4
2

I think 4 but i can't explain how but use the info i know

Explanation:

The electron configuration of an atomic species (neutral or ionic) allows us to understand the shape and energy of its electrons. Many general rules are taken into consideration when assigning the "location" of the electron to its prospective energy state, however these assignments are arbitrary and it is always uncertain as to which electron is being described. Knowing the electron configuration of a species gives us a better understanding of its bonding ability, magnetism and other chemical properties.

i do not get it   at all