Nobelium
actinide · period 7 · group 3 · f-block
Nobelium is a synthetic chemical element with the symbol No and atomic number 102. It is named in honor of Alfred Nobel, the inventor of dynamite and benefactor of science.
What the numbers say
At standard temperature and pressure Nobelium is a solid, sitting in period 7, group 3 of the f-block.
Its melting point of 1100 K (827 °C) is the 58th highest of the 110 elements with a measured value — mid-range among the elements.
Pauling electronegativity is 1.3. Paired with oxygen (3.44) that is a difference of 2.14, which puts the bond predominantly ionic — expect a stable oxide ceramic.
It is reported in 2 oxidation states (2, 3), which sets how many distinct compounds and phases it can form.
First identified in 1958.
Check it against computed structures
The structure search queries the Materials Project, OQMD and the Open Materials Database for computed crystal structures containing No — with DFT formation energy, hull stability and band gap where the provider publishes them.
K 2 · L 8 · M 18 · N 32 · O 32 · P 8 · Q 2
Properties
| Atomic number | 102 |
|---|---|
| Atomic mass | 259 u |
| Series | actinide |
| Group | 3 |
| Period | 7 |
| Block | f-block |
| Phase at STP | Solid |
| Melting point | 1100 K (827 °C) |
| Electronegativity (Pauling) | 1.3 |
| Electron configuration | [Rn] 5f¹⁴ 7s² |
| Oxidation states | 2,3 |
| Discovered | 1958 |
← Back to the periodic table
See No in context with all 118 elements.
Working with nobelium in a real design?
Ask the materials chat how No behaves in your alloy system, what it does to weldability, and which grades to look at — with the source of every number named.