Francium (Fr), element 87 – Learn Acer periodic table

Alkali metal, atomic number 87.

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.

Symbol Fr. Atomic mass 223.0 u. Group 1, period 7. Electron configuration [Rn] 7s1. Electrons per shell 2, 8, 18, 32, 18, 8, 1. State at room temperature: Solid. Melting point 26.9 °C, boiling point 676.9 °C. Discovered by Marguerite Perey.

Element data from Wikipedia, CC BY-SA 3.0.

Francium (Fr), element 87 – Learn Acer periodic table

Francium

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