What are the quantum numbers of Br?

No.

This is the title of a book that teaches how to perform the calculations of Quantum Mechanics, in very simple easy to follow terms.

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Quantum mechanics describes the Zeeman effect as the splitting of energy leves. It is caused by the so called "m" quantum number. This effectively quantises the orientation of the electrons orbit. m can take values from -n to n where n is the principle quantum number. for example if n = 1 then m = -1,0,1. The n=1, m = -1 and the n=1, m=0 quantum staes have slightly different energies and this leads to the splitting of the energy levels as observed by the Zeeman effect