102No259
Nobelium
Actinide · element 102 · f-block (shown below the main table)
Quick facts
| Symbol | No |
|---|---|
| Atomic number | 102 |
| Relative atomic mass | 259 |
| Category | Actinide |
| Position | f-block (shown below the main table) |
| State at 20 °C | Unknown (too few atoms have been made) |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Electronegativity | — |
| Electron configuration | [Rn] 5f14 7s2 |
About Nobelium
Nobelium has the symbol No and atomic number 102, which means every nobelium atom has 102 protons in its nucleus and, in a neutral atom, 102 electrons. At room temperature it is unknown (too few atoms have been made).
Actinides are the second row of the f-block. They are all radioactive, and only a few (like uranium and thorium) occur naturally in large amounts.
Explore it
See where nobelium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.