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Element 105 · Dubnium (Db)

Dubnium Bohr model: diagram and electrons per shell

The dubnium Bohr model shows a dubnium atom (Db) 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, 11 in shell P and 2 in shell Q. This page has a rotating 3D dubnium Bohr model, a flat diagram, a table of the electrons in each shell and the steps to draw it yourself.

Rotate the dubnium Bohr model in 3D

Drag to orbit, scroll to zoom.

This is a Bohr model of dubnium (Db), a simplified picture of a single dubnium atom. Its nucleus holds 105 protons, and a neutral dubnium atom has 105 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, 11 in shell P and 2 in shell Q).

Db K · 21s2 L · 82s2 2p6 M · 183s2 3p6 3d10 N · 324s2 4p6 4d10 4f14 O · 325s2 5p6 5d10 5f14 P · 116s2 6p6 6d3 Q · 27s2

Dubnium Bohr model diagram

Bohr model diagram of dubnium: a nucleus of 105 protons with 105 electrons on 7 shells, 2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 11 in shell P and 2 in shell Q, each ring labelled with its shell letter.
The dubnium 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, 11 in shell P and 2 in shell Q).

Dubnium electrons per shell

A neutral dubnium atom has 105 electrons, one for each of its 105 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, 11 in shell P and 2 in shell Q.

Electrons in each shell of the dubnium Bohr model
ShellShell number (n)ElectronsMost it can hold (2n²)Subshells
K1221s2
L2882s2 2p6
M318183s2 3p6 3d10
N432324s2 4p6 4d10 4f14
O532505s2 5p6 5d10 5f14
P611726s2 6p6 6d3
Q72987s2

How the dubnium Bohr model builds up, shell by shell

Watch the dubnium 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, 11 in shell P and 2 in shell Q) as it forms.

Animation of the dubnium Bohr model being built: a nucleus of 105 protons appears first, then each shell grows in around it and takes its electrons, giving 105 electrons on 7 shells (2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 11 in shell P and 2 in shell Q).
The dubnium 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, 11 in shell P and 2 in shell Q. Protons are red, neutrons yellow and electrons blue.

How to draw the dubnium Bohr model

  1. Find the atomic number. Dubnium has atomic number 105, so a neutral atom has 105 protons and 105 electrons.
  2. Draw the nucleus. Put a circle in the centre and write Db in it. The 105 protons sit there with the neutrons.
  3. 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.
  4. 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, 11 in shell P and 2 in shell Q.
  5. Check the total. 2 + 8 + 18 + 32 + 32 + 11 + 2 = 105, the atomic number, so every electron is accounted for.

Atomic data for the dubnium Bohr model

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

Identity

Symbol
Db
Atomic number
105
Atomic mass
[268] u
Family
Transition Metals
Position
group 5, 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 6d3
Shorthand
*[Rn] 5f14 6d3 7s2
Electrons per shell
2, 8, 18, 32, 32, 11, 2
Outer-shell electrons
2 in shell Q

Physical properties, abundance and history of dubnium

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

Physical properties

Density
29.3 g/cm³

Discovery

Discovered by
Joint Institute for Nuclear Research
Year
1968

Common compounds

  • Dubnium Db
  • lithium;2-[(1S)-1-aminoethyl]-N-[5-chloro-4-(trifluoromethyl)-2-pyridinyl]-1,3-thiazole-5-carboxamide;2-[(1R)-1-aminoethyl]-N-[5-chloro-4-(trifluoromethyl)-2-pyridinyl]-1,3-thiazole-5-carboxamide;2-(1-aminoethyl)-N-[5-chloro-4-(trifluoromethyl)-2-pyridinyl]-1,3-thiazole-5-carboxamide;benzyl N-(1-amino-1-oxopropan-2-yl)carbamate;benzyl N-(1-amino-1-sulfanylidenepropan-2-yl)carbamate;benzyl N-[1-[5-[[5-chloro-4-(trifluoromethyl)-2-pyridinyl]carbamoyl]-1,3-thiazol-2-yl]ethyl]carbamate;bromomethane;5-chloro-4-(trifluoromethyl)pyridin-2-amine;deuterium monohydride;dubnium;ethyl 2-chloro-3-oxopropanoate;ethyl 2-[1-(phenylmethoxycarbonylamino)ethyl]-1,3-thiazole-5-carboxylate;methane;2-[1-(phenylmethoxycarbonylamino)ethyl]-1,3-thiazole-5-carboxylic acid;sulfane;hydroxide C121H129BrCl6DbF15LiN26O23S8
  • CID 58112482 C16H15Cl2DbN8O2S-
  • Carbanide;dubnium;bis(yttrium) CH3DbY2-
  • Dubnium;methanidyl methyl carbonate C3H5DbO3-
  • Carbanide;dubnium;2-(1-ethoxyethylideneamino)oxyethanethiolate C7H15DbNO2S-2
  • Carbanide;dubnium;4-methylbenzenesulfonic acid C8H11DbO3S-
  • carbanide;dubnium;ethyl N-(4-hydroxybutoxy)ethanimidate C9H20DbNO3-

Compounds listed in the PubChem database.

Main isotopes of dubnium

Isotopes of dubnium share the same 105 protons but differ in neutrons. Natural isotopes come first, then the longest-lived others.

Main isotopes of dubnium: mass number, abundance, half-life and decay
Mass numberNatural abundanceHalf-lifeDecay
262–34 sSF, α, β⁺
263–29 sSF, α, β⁺
266–80 minα, SF, β⁺
267–2 hSF
268–29 hSF, β⁺, α
270–1.7 hSF, α

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

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