Periodic Table

Nobelium

Actinide

Quick Facts about Nobelium

Md
  • solid- state of matter at room temperature
  • Radioactive- no stable isotopes exist
  • +3, +2- common oxidation states in compounds
Lr

Nobelium (No) is element 102 on the periodic table. Atomic mass of No: 259.0000 u. No is in period 7. Melting point of No: 1100.00 K.Density of No: 9.90 g/cm³.

Why Nobelium Matters

Nobelium in everyday life and industry

In Your Home

  • No commercial applications
  • Research element only
  • Studies actinide chemistry
  • Very difficult to produce

In Your Body

✗ Not essential

No biological studies possible. Too few atoms and too short-lived. No biological role.

Safety: Nobelium is radioactive

Discovery of Nobelium

Discovered by Nobel Institute for Physics in Sweden, 1957

Name origin: Named in honor of Alfred Nobel, who invented dynamite and founded Nobel prize.

History & Events

1957
Named after Alfred Nobel
1957
Discovery disputed between Soviet and American teams
1958
Generally credited to Ghiorso's team at Berkeley (1958)
1957
Earlier claims from Stockholm (1957) could not be reproduced

About Nobelium

Radioactive metallic transuranic element, belongs to the actinoids. Seven known isotopes exist, the most stable being No-254 with a half-life of 255 seconds. First identified with certainty by Albert Ghiorso and Glenn T. Seaborg in 1966. Unnilbium has been proposed as an alternative name.

Atomic Properties of No

Atomic Number of No
102
Atomic Mass of No
259.0000 u
Electron Configuration
[Rn] 5f14 7s2
Electronegativity
1.30
Block
f-block
Group
Period
7

Physical Properties of No

Phase (STP)
solid
Melting Point of No
1100.00 K
Boiling Point of No
Density of No
9.9000 g/cm3

Atomic Radii

Covalent
176 pm
Van der Waals
246 pm

Common Misconceptions

Wrong:Alfred Nobel discovered nobelium.
Correct:Nobelium honors Alfred Nobel, founder of the Nobel Prizes; he died in 1896, long before the element was made.
Wrong:The original 1957 Swedish discovery of nobelium was confirmed.
Correct:The Swedish claim was later retracted; credit eventually went to Russian and American teams who produced verifiable results.
Wrong:Nobelium behaves like a typical actinide with +3 as the most stable state.
Correct:Nobelium unusually favors the +2 oxidation state, more like alkaline earth metals than other actinides.

Isotopes of Nobelium

Nobelium has 0 naturally occurring isotopes, plus 1 notable radioactive isotope.

IsotopeAtomic Mass (u)AbundanceHalf-LifeDecay Mode
259102No (No-259)Nobelium-259 isotope259.10103

Data source: NIH PubChem (aggregated from IUPAC, NIST)

Uses

It has no significant commercial applications.

Sources

Made by bombarding curium with carbon-13

Geochemistry

Goldschmidt
synthetic

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