21
-11r
-1
-1r
The answer is 7s + 49.
The equivalent is 7s+2s = 9s
5.28751 7s equals 37.
There can be a maximum of 2 electrons in the 7s orbital, following the Pauli exclusion principle which states that each orbital can hold a maximum of 2 electrons with opposite spins.
nothing
1180r80s-8
(3r + 8)(11r - 10)
Expressed algebraically, this would equal 7s - 5.