Recognised as Chemical element
Nobelium
- No
- Z = 102
- actinide
- No stable isotope
Nobelium (No) is element 102, a actinide in period 7. Its most stable isotope has mass number 259. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolNo
Mass number of the most stable isotope259this element has no stable isotope
Mass in kilograms4.3007962 × 10^-25
Categoryactinide
GroupLanthanide/actinide series, with no group number
Period7
Blockf-block
Electrons in a neutral atom102
Neutrons in the most common isotope157≈
Quantities
Molar mass259 g/mol
Mass of one mole259 grams
Atoms in one gram2.3251509 × 10^21
Mass of one atom4.3007962 × 10^-22 g
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