98Cf251
Californium
Actinide · element 98 · f-block (shown below the main table)
Quick facts
| Symbol | Cf |
|---|---|
| Atomic number | 98 |
| Relative atomic mass | 251 |
| Category | Actinide |
| Position | f-block (shown below the main table) |
| State at 20 °C | Solid |
| Melting point | 900 °C |
| Boiling point | — |
| Density | 15.1 g/cm³ |
| Electronegativity | 1.3 |
| Electron configuration | [Rn] 5f10 7s2 |
About Californium
Californium has the symbol Cf and atomic number 98, which means every californium atom has 98 protons in its nucleus and, in a neutral atom, 98 electrons. At room temperature it is a solid.
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.
It melts at 900 °C.
Explore it
See where californium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.