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Francium

Noun - Chemistry: A highly radioactive chemical element with the symbol Fr and atomic number 87, belonging to the alkali metal group.

Sample sentence: To observe francium, specialized equipment is required due to its extreme rarity and intense radioactivity.

Noun - Physics: An extremely unstable, radioactive metal that is part of the alkali metal group, with the symbol Fr and atomic number 87.

Sample sentence: Researchers are working on studying the properties of francium and its potential applications in particle physics.

Adjective: Pertaining to or derived from francium.

Sample sentence: The francium compound exhibited unique chemical properties in the laboratory.