Element 107 · Bohrium (Bh)

Bohrium Bohr model: diagram and electrons per shell

The bohrium Bohr model shows a bohrium atom (Bh) as a small nucleus with its electrons circling it in 7 shells: 2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q. This page has a rotating 3D bohrium Bohr model, a flat diagram, a table of the electrons in each shell and the steps to draw it yourself.

Rotate the bohrium Bohr model in 3D

Drag to orbit, scroll to zoom.

This is a Bohr model of bohrium (Bh), a simplified picture of a single bohrium atom. Its nucleus holds 107 protons, and a neutral bohrium atom has 107 electrons, arranged around it in 7 shells (2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q).

Bh K · 21s² L · 82s² 2p⁶ M · 183s² 3p⁶ 3d¹⁰ N · 324s² 4p⁶ 4d¹⁰ 4f¹⁴ O · 325s² 5p⁶ 5d¹⁰ 5f¹⁴ P · 136s² 6p⁶ 6d⁵ Q · 27s²

Bohrium Bohr model diagram

Bohr model diagram of bohrium: a nucleus of 107 protons with 107 electrons on 7 shells, 2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q, each ring labelled with its shell letter. — The bohrium Bohr model drawn flat: each ring is a shell, labelled with its letter, and every dot is an electron (2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q).

Bohrium electrons per shell

A neutral bohrium atom has 107 electrons, one for each of its 107 protons. They fill the shells from the nucleus outwards: 2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q.

Electrons in each shell of the bohrium Bohr model
Shell	Shell number (n)	Electrons	Most it can hold (2n²)	Subshells
K	1	2	2	1s²
L	2	8	8	2s² 2p⁶
M	3	18	18	3s² 3p⁶ 3d¹⁰
N	4	32	32	4s² 4p⁶ 4d¹⁰ 4f¹⁴
O	5	32	50	5s² 5p⁶ 5d¹⁰ 5f¹⁴
P	6	13	72	6s² 6p⁶ 6d⁵
Q	7	2	98	7s²

How the bohrium Bohr model builds up, shell by shell

Watch the bohrium Bohr model come together: the nucleus first, then each shell in turn, from the innermost outwards, with its electrons joining the ring. The legend names every shell and counts its electrons, so you can read off the arrangement (2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q) as it forms.

Animation of the bohrium Bohr model being built: a nucleus of 107 protons appears first, then each shell grows in around it and takes its electrons, giving 107 electrons on 7 shells (2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q). — The bohrium Bohr model built up in six seconds: the nucleus first, then each shell with its electrons, ending with 2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q. Protons are red, neutrons yellow and electrons blue.

How to draw the bohrium Bohr model

Find the atomic number. Bohrium has atomic number 107, so a neutral atom has 107 protons and 107 electrons.
Draw the nucleus. Put a circle in the centre and write Bh in it. The 107 protons sit there with the neutrons.
Draw the shells. Sketch 7 shells as rings around the nucleus. A shell holds at most 2n² electrons: 2 in the first, 8 in the second, 18 in the third and 32 in the fourth.
Place the electrons. Fill from the inside out: 2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 13 in shell P and 2 in shell Q.
Check the total. 2 + 8 + 18 + 32 + 32 + 13 + 2 = 107, the atomic number, so every electron is accounted for.

Atomic data for the bohrium Bohr model

The numbers behind the bohrium Bohr model, grouped by topic. Radii are in picometres (pm) and energies in kilojoules per mole (kJ/mol).

Identity

Symbol: Bh
Atomic number: 107
Atomic mass: [270] u
Family: Transition Metals
Position: group 7, period 7
Block: d-block

Electron configuration

Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d⁵
Shorthand: *[Rn] 5f¹⁴ 6d⁵ 7s²
Electrons per shell: 2, 8, 18, 32, 32, 13, 2
Outer-shell electrons: 2 in shell Q

Physical properties, abundance and history of bohrium

Bulk properties of bohrium, how common it is, who discovered it and some of its compounds.

Physical properties

Density: 37.1 g/cm³

Discovery

Discovered by: Gesellschaft für Schwerionenforschung
Year: 1981

Common compounds

Bohrium Bh
bohrium;(1R,5R,8R)-4-methanidyl-8,12-dimethyl-3-(trifluoromethyl)-2,13-dioxatricyclo[7.4.1.05,14]tetradec-3-en-12-ol C16H22BhF3O3-
CID 57587824 CH2BhP-
Bohrium;potassium BhK
(2S)-2-amino-4-phenylbutanoic acid;bohrium C10H13BhNO2
(2S)-2-[[(2S)-4-[bis[2-(methylamino)ethyl]amino]-2-(methylamino)-4-oxobutanoyl]amino]-4-phenylbutanoic acid;bohrium C21H35BhN5O4
Bohrium;methanidyloxymethane C2H5BhO-
Bohrium;carbanide CH3Bh-

Compounds listed in the PubChem database.

Main isotopes of bohrium

Isotopes of bohrium share the same 107 protons but differ in neutrons. Natural isotopes come first, then the longest-lived others.

Main isotopes of bohrium: mass number, abundance, half-life and decay
Mass number	Natural abundance	Half-life	Decay
266	–	10.6 s	α, β⁺, SF
267	–	22 s	α
270	–	3.8 min	α
271	–	2.9 s	α
272	–	11.3 s	α
274	–	57 s	α

α = alpha decay, β⁻ = beta-minus, β⁺ = beta-plus, EC = electron capture, SF = spontaneous fission, p / n = proton / neutron emission.

More about bohrium

Bohrium on the periodic table – properties, isotopes, uses and the full bohrium page.
Transition Metals – all transition metal elements and their trends.
Bohr model of every element – the Bohr model of all 118 elements.