Which set of quantum numbers $(n,l, m_{l,}{m}_s)$ is possible for the outermost electron in a Strontium atom in its ground state?

Quantum numbers $(n,l, m_{l,}{m}_s)$ are possible for the outermost electron in a Strontium atom in its ground state is $5,0,0,-\frac{1}{2}$.

Quantum numbers. To find an electron's address in an atom, quantum numbers are helpful. Quantum numbers come in four different subcategories.
1) The fundamental quantum numbers.
2) Azimuthal quantum numbers.
3) Quantum numbers with magnetic fields.
4) Spin quantum numbers. Principal quantum numbers.

Hence, option A is correct.