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Element 102 · Nobelium (No)

Nobelium Bohr model: diagram and electrons per shell

The nobelium Bohr model shows a nobelium atom (No) 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, 8 in shell P and 2 in shell Q. This page has a rotating 3D nobelium Bohr model, a flat diagram, a table of the electrons in each shell and the steps to draw it yourself.

Rotate the nobelium Bohr model in 3D

Drag to orbit, scroll to zoom.

This is a Bohr model of nobelium (No), a simplified picture of a single nobelium atom. Its nucleus holds 102 protons, and a neutral nobelium atom has 102 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, 8 in shell P and 2 in shell Q).

No K · 21s2 L · 82s2 2p6 M · 183s2 3p6 3d10 N · 324s2 4p6 4d10 4f14 O · 325s2 5p6 5d10 5f14 P · 86s2 6p6 Q · 27s2

Nobelium Bohr model diagram

Bohr model diagram of nobelium: a nucleus of 102 protons with 102 electrons on 7 shells, 2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 8 in shell P and 2 in shell Q, each ring labelled with its shell letter.
The nobelium 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, 8 in shell P and 2 in shell Q).

Nobelium electrons per shell

A neutral nobelium atom has 102 electrons, one for each of its 102 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, 8 in shell P and 2 in shell Q.

Electrons in each shell of the nobelium 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
P68726s2 6p6
Q72987s2

How the nobelium Bohr model builds up, shell by shell

Watch the nobelium 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, 8 in shell P and 2 in shell Q) as it forms.

Animation of the nobelium Bohr model being built: a nucleus of 102 protons appears first, then each shell grows in around it and takes its electrons, giving 102 electrons on 7 shells (2 in shell K, 8 in shell L, 18 in shell M, 32 in shell N, 32 in shell O, 8 in shell P and 2 in shell Q).
The nobelium 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, 8 in shell P and 2 in shell Q. Protons are red, neutrons yellow and electrons blue.

How to draw the nobelium Bohr model

  1. Find the atomic number. Nobelium has atomic number 102, so a neutral atom has 102 protons and 102 electrons.
  2. Draw the nucleus. Put a circle in the centre and write No in it. The 102 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, 8 in shell P and 2 in shell Q.
  5. Check the total. 2 + 8 + 18 + 32 + 32 + 8 + 2 = 102, the atomic number, so every electron is accounted for.

Atomic data for the nobelium Bohr model

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

Identity

Symbol
No
Atomic number
102
Atomic mass
[259] u
Family
Actinides
Position
period 7 of the f-block
Block
f-block

Electron configuration

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

Ionisation energies

I₁
642

Energy to remove each electron in turn (kJ/mol). A sharp jump means the next electron comes from an inner shell.

Electronegativity and electron affinity

Electronegativity (Pauling)
1.3
Electron affinity (kJ/mol)
-223.22

Oxidation states

+3

Charges the element commonly takes in compounds.

Physical properties, abundance and history of nobelium

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

Physical properties

Phase at room conditions
Solid
Melting point
826.85°C (1100 K)

Discovery

Discovered by
Joint Institute for Nuclear Research
Year
1966

Common compounds

  • Nobelium No
  • CID 157805640 C18H12BF3NNoO2S
  • CID 159413477 C38H33BF3N2NoO2S
  • CID 161222405 C37H29BF3N2NoO2S
  • 1,1,1,4,4,4-hexafluorobut-2-ene;(Z)-1,1,1,4,4,4-hexafluorobut-2-ene;nobelium C8H4F12No
  • carbanide;methanol;4-methyl-7-morpholin-4-yl-N-[1-[3-(trifluoromethyl)benzene-5-id-1-yl]ethyl]pyrido[3,4-d]pyridazin-1-amine;nobelium C23H28F3N5NoO2-2
  • CID 134889153 C35H29NoO5P-
  • Carbanide;2-dimethylphosphanylethyl(dimethyl)phosphane;trichloronobelium C7H19Cl3NoP2-

Compounds listed in the PubChem database.

Main isotopes of nobelium

Isotopes of nobelium share the same 102 protons but differ in neutrons. Natural isotopes come first, then the longest-lived others.

Main isotopes of nobelium: mass number, abundance, half-life and decay
Mass numberNatural abundanceHalf-lifeDecay
253–1.57 minα, β⁺, SF
254–51.2 sα, β⁺, SF
255–3.52 minβ⁺, α
256–2.91 sα, SF, EC
257–24.5 sα, β⁺, SF
259–58 minα, EC, SF

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

More about nobelium