Atomic number 103
Lawrencium
Actinide
No photo: here’s why
Lawrencium is a synthetic element made only in vanishingly small, intensely radioactive amounts - its atoms decay so quickly that no piece big enough to see or photograph has ever existed.
Quick facts
- Atomic mass
- 266.00
- Group
- –
- Period
- 7
- State (STP)
- solid
- Electronegativity
- 1.30
- Common ox. states
- +3
Properties
[Rn] 5f¹⁴ 7s² 7p¹
- Ionization energy
- 470.0 kJ/mol
- Electron affinity
- –
- Melting point
- 1900.00 K (1626.8 °C)
- Boiling point
- –
How dangerous is it?
The heaviest of this family, it is made only an atom at a time and disappears so fast it exists only inside research equipment.
- RadioactiveImmediate
Its atoms are produced singly and decay within seconds, each one intensely radioactive for its brief life. (exists only as a fleeting trace in research, never in everyday surroundings)
Studied only as individual atoms inside shielded apparatus by specialist labs.
How it bonds· family overview
Lawrencium (Lr) is an actinide. Like the lanthanides it tends toward a +3 oxidation state, but the early actinides (Th–Am) routinely access +4, +5, +6, even +7 because the 5f electrons are easier to ionize. Most actinides are radioactive; their "bonding" in school is read off the periodic table, not measured in lab.
