Yes. Francium is a metal, classified as an alkali metal on the periodic table.

How many protons does francium have?

Francium has 87 protons. Its atomic number is 87, which is also the number of electrons in a neutral atom of francium.

What group and period is francium in?

Francium is in group 1 and period 7 of the periodic table, in the s-block.

What is the atomic mass of francium?

The atomic mass of francium is 223 u (unified atomic mass units).

Element 87

Francium (Fr)

Alkali metal · Period 7 · Group 1 · s-block

Francium (Fr) is element 87 of the periodic table, an alkali metal in period 7, group 1 (s-block) with an atomic mass of 223 and is a solid at standard conditions.

At a glance

Atomic number: 87
Symbol: Fr
Atomic mass: 223 u
Category: Alkali metals
Period: 7
Group: 1
Block: s-block
Phase at STP: solid

Electron structure

Electron configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 7s1
Shorthand configuration: [Rn] 7s1
Electrons per shell: 2, 8, 18, 32, 18, 8, 1
Oxidation states: +1

Physical properties

Francium is extremely rare and intensely radioactive, and no weighable sample has been isolated. The physical and atomic values below are estimates extrapolated from periodic trends, not direct measurements.

Melting point: 300 K (26.85 °C) (estimated)
Boiling point: 950 K (676.85 °C) (estimated)
Density: 1.87 g/cm³ (estimated)
Phase: solid

Atomic properties

Electronegativity (Pauling): 0.79 (estimated)
Atomic radius: 348 pm (estimated)
Covalent radius: 260 pm (estimated)
Van der Waals radius: 348 pm (estimated)
First ionization energy: 380 kJ/mol (estimated)
Electron affinity: 47 kJ/mol (estimated)

Notable isotopes

Notable isotopes of Francium: mass number, atomic mass, natural abundance, and stability.
Isotope	Mass	Abundance	Stability
Fr-223	223.01974	-	Half-life 22 minutes

Common uses

Scientific research only

Discovery

Year: 1939
Discovered by: Marguerite Perey
Country: France

Frequently asked questions

Is francium a metal?: Yes. Francium is a metal, classified as an alkali metal on the periodic table.
How many protons does francium have?: Francium has 87 protons. Its atomic number is 87, which is also the number of electrons in a neutral atom of francium.
What group and period is francium in?: Francium is in group 1 and period 7 of the periodic table, in the s-block.
What is the atomic mass of francium?: The atomic mass of francium is 223 u (unified atomic mass units).

Keep exploring

Francium's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.