87 Fr 223
Francium
alkali metal
Properties
- Atomic number
- 87
- Atomic mass
- 223 u
- Category
- alkali metal
- Group
- 1
- Period
- 7
- Block
- s-block
- State (room temp)
- Solid
- Outer-shell electrons
- 1
- Electronegativity
- 0.79 (Pauling)
- Density
- 1.87 g/cm³
- Melting point
- 26.85 °C
- Boiling point
- 676.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹
Noble-gas shorthand: [Rn] 7s¹
Electrons per shell: 2, 8, 18, 32, 18, 8, 1, which is 1 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Francium
Francium is a chemical element with symbol Fr and atomic number 87. It used to be known as eka-caesium and actinium K. It is the second-least electronegative element, behind only caesium. Francium is a highly radioactive metal that decays into astatine, radium, and radon.
- Discovered by Marguerite Perey
Francium: frequently asked questions
- What is Francium?
- Francium (Fr) is the chemical element with atomic number 87. It is a metal: specifically an alkali metal.
- What is the atomic number of Francium?
- Francium's atomic number is 87, which means every Francium atom has 87 protons in its nucleus.
- What is the electron configuration of Francium?
- The electron configuration of Francium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s1 (noble-gas shorthand: [Rn] 7s1). Its electrons are arranged in shells of 2, 8, 18, 32, 18, 8, 1, with 1 in the outermost shell.
- Is Francium a metal or a nonmetal?
- Francium is a metal: specifically an alkali metal.
- What group and period is Francium in?
- Francium is in group 1 and period 7 of the periodic table.
- Is Francium a solid, liquid, or gas?
- At room temperature, Francium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.