87 Fr
Alkali metal
Francium
Most reactive metal.
Properties of Francium
- Atomic number (Z)
- 87
- Symbol
- Fr
- Atomic mass
- 223 g/mol
- Category
- Alkali metal
- Group
- 1
- Period
- 7
- Electron configuration
- [Rn] 7s¹
- Electronegativity (Pauling)
- 0.7
- Atomic radius
- —
- First ionization energy
- 393 kJ/mol
- Melting point
- 300 K (26.9 °C)
- Boiling point
- 950 K (676.9 °C)
- Density
- 1.87 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1939
Frequently asked questions
What is Francium?
Francium (Fr) is an alkali metal, element number 87 on the periodic table. Most reactive metal.
What is the atomic number and atomic mass of Francium?
Francium has atomic number 87 and an atomic mass of about 223 g/mol.
What is the electron configuration of Francium?
The electron configuration of Francium is [Rn] 7s¹.
Where is Francium on the periodic table?
Francium sits in group 1, period 7, and is classified as a alkali metal.