Francium (Fr)
Francium (Fr, element 87) is an alkali metal in group 1, period 7. Atomic mass 223, electron configuration [Rn] 7s¹, uses and facts.
About Francium
Francium is an alkali metal with the symbol Fr and atomic number 87. It is a solid at room temperature, and it sits in group 1, period 7 of the periodic table. Francium was discovered in 1939 by Marguerite Perey.
Francium key facts
- Atomic number: 87
- Symbol: Fr
- Atomic mass: 223 u
- Category: alkali metal
- Group: 1
- Period: 7
- State at room temperature: solid
- Electron configuration: [Rn] 7s¹
- Electronegativity (Pauling): 0.79
- Melting point: 300 K (26.85 °C)
- Boiling point: 950 K (676.85 °C)
- Density: not known
- Common oxidation states: +1
Electron configuration
The electron configuration of francium is [Rn] 7s¹. The part in brackets is the noble gas core; the rest shows how the outer electrons fill their subshells. Francium has 1 valence electron.
Uses of francium
- Research only
Did you know?
Francium is so rare that less than 30 grams exist in all of Earth's crust at any moment.
Other elements in group 1 and neighbours
Frequently asked questions
What is the atomic number of francium?
The atomic number of francium is 87, which means every francium atom has 87 protons.
What is the electron configuration of francium?
The electron configuration of francium is [Rn] 7s¹.
What group and period is francium in?
Francium is an alkali metal in group 1, period 7.
What state is francium at room temperature?
Francium is a solid at room temperature.
What is francium used for?
Francium is used for research only.