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Nobelium (No)

Nobelium is a chemical element of the periodic table with chemical symbol No and atomic number 102 with an atomic weight of 259 u and is classed as actinide. Nobelium is solid at room temperature.

Nobelium in the periodic table

SymbolNo
Atomic number102
Group-
Period7
Blockf
ClassificationActinide
Appearance-
Color-
Number of protons102 p+
Number of neutrons157 n0
Number of electrons102 e-
From Wikipedia, the free encyclopediaNobelium is a synthetic chemical element with symbol No and atomic number 102. It is named in honor of Alfred Nobel, the inventor of dynamite and benefactor of science. A radioactive metal, it is the tenth transuranic element and is the penultimate member of the actinide series.

Physical properties

Phase at STPSolid
Density g/cm3
Atomic weight259 u

Thermal properties

Melting point1100 K
826.85 °C
1520.33 °F
Boiling point-
Heat of vaporization-

Atomic properties

Electronegativity (Pauling Scale)1.3
Electron affinity-223.22 kJ/mol
Oxidation states+2, +3
()
Ionization energies
  1. 642 kJ/mol
  2. 1254 kJ/mol
  3. 2643 kJ/mol
  4. 3956 kJ/mol

Electron configuration for nobelium

Electron configuration
Shorthand configuration
[Rn] 5f14 7s2
Electron configuration
Full configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2
Electron configuration chart
1s2
2s22p6
3s23p63d10
4s24p64d104f14
5s25p65d105f14
6s26p6
7s2
Electrons per shell2, 8, 18, 32, 32, 8, 2
Valence electrons 2
Valency electrons 3
Bohr model
NobeliumElectron shell for Nobelium, created by Injosoft ABNo
Figure: Shell diagram of Nobelium (No) atom.
Orbital Diagram
1s
2s2p
3s3p3d
4s4p4d4f
5s5p5d5f
6s6p
7s

The history of Nobelium

DiscoveryJoint Institute for Nuclear Research (1966)

Identifiers

List of unique identifiers for Nobelium in various chemical registry databases
CAS Number10028-14-5
ChemSpider ID23207
EC number-
PubChem CID Number24822