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102 · No

Nobelium

The Swedish announcement of 1957 is not upheld. Priority goes to the Dubna work, in 1966. The name nobelium remained.

Identity

Atomic number
102
Symbol
No
Canonical name
Nobelium
Category
actinide
Group
unassigned
Period
7
Block
f

Series set apart from the main table. Whether group 3 is lanthanum or lutetium (actinium or lawrencium) is still discussed, so the group is left empty.

Properties

These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.

Atomic mass
[259] No standard atomic weight. The number shown is the conventional mass number used in tables, not a measured mass in u.
Electron configuration
[Rn] 5f14 7s2
Electrons per shell
2, 8, 18, 32, 32, 8, 2
Standard state
solid
Melting point
1,100 K
Electronegativity
1.3 Pauling
First ionization energy
642 kJ/mol
Electron affinity
-223.22 kJ/mol

Notable isotopes

This summary is not an inventory of every isotope.

Conventional mass number: 259

History

Stockholm announcement

Discovery · rejected · 1957

The Nobel Institute announces element 102. This claim is not upheld. The name nobelium was nevertheless kept.

Dubna work upheld

Synthesis · confirmed · 1966

Discovery priority for nobelium is assigned to the Dubna work, not to the 1957 announcement.

See the element timeline

Etymology

Theme
scientist
Language
suédois
Root
Nobel
Meaning
Alfred Nobel

The name was kept even though the 1957 Swedish claim was not upheld.

Scientists

Places and institutions

  • Stockholm — historical setting : Sweden — present country : Sweden
  • Dubna — historical setting : Soviet Union — present country : Russia

See also

Sources