Question

which of the following statements provides information about the magnetic spin quantum number of an electron?

a. an electron is one of two found in the same atom.
b. an electron occupies an orbital with another electron having a spin of -1/2.
c. an electron is in an s orbital in an atom.
d. all of the above

Explanation:

The magnetic - spin quantum number ($m_s$) can have values of $+\frac{1}{2}$ or $-\frac{1}{2}$. Option B mentions an electron having a spin of $-\frac{1}{2}$, which provides information about the magnetic - spin quantum number. Option A only says an electron is one of two in the same atom without specifying spin. Option C only gives information about the orbital type (s - orbital) and not the spin.

Answer:

B. An electron occupies an orbital with another electron having a spin of -½.