Consider Ground-State Helium Having Two Electrons in Orbit $\left( n , \ell l , m _ { 1 } , m _ { s } \right)$

Multiple Choice

Consider ground-state helium having two electrons in orbit. If one of the electrons has quantum numbers $\left( n , \ell l , m _ { 1 } , m _ { s } \right)$ of $1,0,0 , - 1 / 2$ respectively, the quantum numbers for the other electron will be

A) $1,0,0 , + 1 / 2$ .
B) $1,1,0 , - 1 / 2$ .
C) $1,1,1 , + 1 / 2$ .
D) none of the given answers.