103Lr266
Lawrencium
Actinide · element 103 · f-block (shown below the main table)
Quick facts
| Symbol | Lr |
|---|---|
| Atomic number | 103 |
| Relative atomic mass | 266 |
| 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 7p1 |
About Lawrencium
Lawrencium has the symbol Lr and atomic number 103, which means every lawrencium atom has 103 protons in its nucleus and, in a neutral atom, 103 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 lawrencium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.