102No259.000
Actinidef-blockRadioactive
Nobelium
Element 102 on the periodic table, symbol No, group 3, period 7.
Nobelium is a synthetic chemical element with symbol No and atomic number 102. It is named in honor of Alfred Nobel, the inventor of dynamite and benefactor of science. A radioactive metal, it is the tenth transuranic element and is the penultimate member of the actinide series.
Properties
- Atomic Number
- 102
- Atomic Mass
- 259.0000 u
- Group
- 3
- Period
- 7
- Block
- f-block
- Category
- Actinide
- State at 25 °C
- Solid
- Melting Point
- 1,100 K · 826.9 °C
- Boiling Point
- Not measured
- Density
- Not measured
- Atomic Radius
- Not measured
- Electronegativity
- 1.3
- Oxidation States
- +2, +3
- Abundance in Crust
- Vanishingly rare
- Discovered
- 1966
- Discovered By
- Joint Institute for Nuclear Research
Electron Configuration
[Rn] 5f14 7s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14
Ionisation Energies (kJ/mol)
- 1. 642
Elements near Nobelium
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.