Question

1. list the four variables that define an electron according to quantum theory.

Explanation:

Quantum theory uses four quantum numbers to define an electron. The principal quantum number ($n$) describes the energy level or shell. The angular momentum quantum number ($l$) indicates the sub - shell (s, p, d, f etc.). The magnetic quantum number ($m_l$) gives the orientation of the orbital in space. The spin quantum number ($m_s$) represents the electron's spin (either $+\frac{1}{2}$ or $-\frac{1}{2}$).

Answer:

Principal quantum number ($n$), angular momentum quantum number ($l$), magnetic quantum number ($m_l$), spin quantum number ($m_s$)