Lawrencium (Lr)
Lawrencium (Lr, element 103) is an actinide in period 7. Atomic mass 266, electron configuration [Rn] 5f¹⁴ 7s² 7p¹, uses and facts.
About Lawrencium
Lawrencium is an actinide with the symbol Lr and atomic number 103. It is a solid at room temperature, and it sits in period 7 of the periodic table. Lawrencium was discovered in 1961 by Albert Ghiorso.
Lawrencium key facts
- Atomic number: 103
- Symbol: Lr
- Atomic mass: 266 u
- Category: actinide
- Group: none (f-block)
- Period: 7
- State at room temperature: solid
- Electron configuration: [Rn] 5f¹⁴ 7s² 7p¹
- Electronegativity (Pauling): 1.3
- Melting point: 1900 K (1626.85 °C)
- Boiling point: not known
- Density: not known
- Common oxidation states: +3
Electron configuration
The electron configuration of lawrencium is [Rn] 5f¹⁴ 7s² 7p¹. The part in brackets is the noble gas core; the rest shows how the outer electrons fill their subshells.
Uses of lawrencium
- Research only
Did you know?
Named after Ernest Lawrence, inventor of the cyclotron. Last of the actinides.
Neighbouring elements
- Nobelium (No)
- Rutherfordium (Rf)
- Actinium (Ac)
- Thorium (Th)
- Protactinium (Pa)
- Uranium (U)
- Neptunium (Np)
- Plutonium (Pu)
- Americium (Am)
- Curium (Cm)
Frequently asked questions
What is the atomic number of lawrencium?
The atomic number of lawrencium is 103, which means every lawrencium atom has 103 protons.
What is the electron configuration of lawrencium?
The electron configuration of lawrencium is [Rn] 5f¹⁴ 7s² 7p¹.
What group and period is lawrencium in?
Lawrencium is an actinide in period 7.
What state is lawrencium at room temperature?
Lawrencium is a solid at room temperature.
What is lawrencium used for?
Lawrencium is used for research only.