Question

Question #ee960

Answer 1

There are eight electrons in the antepenultimate shell of bromine.

Explanation:

Bromine has atomic number 35.

Its electron configuration is `"1s"^2color(white)(l) "2s"^2 "2p"^6color(white)(l) "3s"^2 "3p"^6color(white)(l) "4s"^2 "3d"^10 "4p"^5`.

The outermost shell (`"4s"^2 "3d"^10 "4p"^5`) contains 17 electrons.

The penultimate (almost the last) shell (`"3s"^2 "3p"^6`) contains eight electrons.

The antepenultimate (before the penultimate) shell (`"2s"^2 "2p"^6`) contains eight electrons.