A variation on the theme of being âclosetedâ, which refers to the tendency to ignore, remove, falsify or re-explain evidence of bisexuality in history, academia, the news media and other primary sources.
The electronic configuration of Bromine is [Ar] 4s2 3d10 4p5 so there are seven valence electrons, two in the 4s orbital and 5 in the 4p orbital.
For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used. The electron configuration can be visualized as the core electrons, equivalent to the noble gas of the preceding period, and the valence electrons: each element in a period differs only by the last few subshells.