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Reference




Nobelium
Chemical Properties & Compounds



Symbol Atomic Number Atomic Weight Melting Point Boiling Point Phase Density Classification
No 102 259 827 °C Unknown Solid Unknown Metal Radioactive Synthetic Element


102 mendeleviumnobeliumlawrencium
Yb

No

(Upb)
General
Name, Symbol, Number nobelium, No, 102
Chemical series actinides
Group, Period, Block n/a, 7, f
Appearance unknown, probably silvery
white or metallic gray
Standard atomic weight (259)  g·mol−1
Electron configuration [Rn] 5f14 7s2
Electrons per shell 2, 8, 18, 32, 32, 8, 2
Physical properties
Phase solid
Melting point 1100 K
(827 °C, 1521 °F)
Atomic properties
Oxidation states 2, 3
Electronegativity 1.3 (scale Pauling)
Ionization energies 1st: 642 kJ/mol
Miscellaneous
CAS registry number 10028-14-5
Selected isotopes
Main article: Isotopes of nobelium
iso NA half-life DM DE (MeV) DP
253No syn 1.7 m α 8.440 249Fm
ε 3.200 253Md
255No syn 3.1 m α 8.445 251Fm
ε 2.012 255Md
259No syn 58 m α 7.910 255Fm
ε 0.500 259Md
SF - -
References
Nobelium Compounds

Source: Wikipedia article Nobelium


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