Answer:
The answer is n = 4 , l = 1, m= +1 , ms = -1/2
Explanation:
When br atom gains one electron its atomic number becomes
36 br = 35
electronic config. = [ar] 3d 104s 24p5 br- = 36 = [ar] 3d 104s 24p6
so the electron goes into 4p that means
n = 4 , l = 1, m= +1 , ms = -1/2
