Answer:
Its A
Explanation:
B doesn't make sense because its the exact same process, it can't be easier
B.
I hope this will help a bit (Forgive me of its wrong pls)
The electron configuration of lithium atom is:
![Li:[He]2s^1](https://tex.z-dn.net/?f=Li%3A%5BHe%5D2s%5E1)
The number "2" is the value of the principal quantum number "n". Letter "s" is associated with the value of secondary quantum number "l" and it is equal to zero. The value of "m" (or magnetic quantum number) is zero too. The quantum number set for the highest energy electron will be (2, 0, 0, 1/2).
My thought would be B) gases.
I could be wrong but that's what i'd say