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Francium - Wikipedia
Francium - Element information, properties and uses | Periodic …
Francium | Radioactive, Alkali Metal, Rare | Britannica
Francium Facts (Atomic Number 87 or Fr) - ThoughtCo
Francium: Facts about the elusive radioactive element
Francium: Element 87 - Properties, History, and Uses
Francium | History, Uses, Facts, Physical & Chemical Characteristics
Francium (Fr) - Definition, Preparation, Properties, Uses
Francium (Fr) - Periodic Table
Francium - Periodic Table