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Nobelium (No)

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.

Nobelium in the periodic table

SymbolNo
Atomic number102
Group0
Period7
Blockf
Element categoryActinide

Physical properties

Phase at STPSolid
Density g/cm3
Atomic weight259 u
Melting point1100 K
826.85 °C
1520.33 °F
Boiling point K
°C
°F

Atomic properties

Electronegativity (Pauling Scale)1.3
Electron affinity-223.22 kJ/mol
Oxidation states+2, +3
()
Ionization energies
1642 kJ/mol
21254 kJ/mol
32643 kJ/mol
43956 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f14 7s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2
Electrons per shell2, 8, 18, 32, 32, 8, 2

History

Discovered1966
Discovered byJoint Institute for Nuclear Research
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