What is the quontem number of lonely electron of br (bromium)

answer: the quantum numbers for the electron bromine gains are n = 4, l = 1= p, ml = +1, ms = -1/2. the quantum numbers for the electron bromine gains are n = 4, l = 1= p, ml l = +1, ms s = -1/2.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.