Isotopes of nobelium

Isotopes of nobelium (₁₀₂No)
β+45%	253Md
β+10%	254Md
β+39%	255Md
β+1%	257Md
ε25%	259Md
SF<10%	–
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Nobelium (₁₀₂No) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized (and correctly identified) was ²⁵⁴No in 1966. There are fourteen known radioisotopes, which are ²⁴⁸No to ²⁶⁰No and ²⁶²No, and many isomers. The longest-lived isotope is ²⁵⁹No with a half-life of 58 minutes. The longest-lived isomer is ^251m1No with a half-life of 1.02 seconds.

^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

[NUBASE2020-1] Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

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