Br- (36) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

Bromine(BR) 1s(1) 2s(2) p(6), 3s(2) p(6),3d(10)4s(2), p(5)

Explanation:

Group 7A elements have a -1 electron configuration.

Beginning at the top left and going across the rows of the periodic table provides a method for remembering the order

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.