Electronic configuration of bohrium

Electrons in each shell

Bohrium has 107 electrons arranged as 2, 8, 18, 32, 32, 13, 2 across 7 shells, which is why it sits in period 7.

Elements this heavy last for only a moment, so this configuration is predicted from theory rather than measured.

How to write it

Start from the previous noble gas core, written in square brackets, then add the remaining electrons in filling order. For bohrium that gives [Rn] 5f¹⁴ 6d⁵ 7s².

Bohrium at a glance

Other elements in group 7