How many valence electrons in a ground state sulfur atom can have the quantum numbers ml = +1 and ms = + ?
a. 6
b. 1

B. 1

Explanation:

The quantum numbers are:

n -> principal, which represents the shell and varies from 1 to 7;

l -> azimuthal, which represents the subshell and varies from 0 to 3;

ml -> magnetic, which represents the orbital and varies from -l to +l passing by 0;

ms -> spin, which represents the spin of the electron, +1/2 or -1/2

Each orbital (ml) can have at least 2 electrons, each one with different ms numbers. So, only 1 electron is possible to have quantum numbers ml = +1 and ms = +1/2 in the valence shell.