Answer:
Explanation:
The innermost electron shell is the lowest principal energy level, i.e n = 1.
For n = 1 there is only one orbital, the 1s orbital.
As stated by the Pauli's exculsion principle an orbital may have a maximum of two electrons, and they have opposed spins.
Then, the innermost electron shell has just one orbital and, in consequence, can hold up to 2 elecrons.
