Question

how many quantum numbers are necessary to designate the location of a particular electron in an atom? 3 4 2 1 5

Explanation:

To designate the 'location' of an electron in an atom, four quantum numbers are used. The principal quantum number ($n$) describes the energy level or shell. The azimuthal quantum number ($l$) gives the sub - shell (s, p, d, f etc.). The magnetic quantum number ($m_l$) specifies the orbital within the sub - shell. The spin quantum number ($m_s$) indicates the spin state of the electron (either $+\frac{1}{2}$ or $-\frac{1}{2}$).

Answer:

4