F

Francium

Quick Reference
Formula / NotationFr
Molecular Weight223
CategoryElements

What is Francium?

Francium is a highly radioactive alkali metal and the second-rarest naturally occurring element. It occurs only as a decay product of actinium. Its chemistry resembles caesium, though its extreme instability means properties have been difficult to measure directly.

Formula & Notation

Fr

Properties & Characteristics

Appearance: silvery metal (predicted). Melting point: 8.0 °C (predicted). Density: ~1.87 g/cm³ (predicted). Atomic radius: 348 pm (largest of any element).

Uses & Applications

No practical uses due to extreme radioactivity and scarcity. Used only in atomic physics research to study fundamental properties.

Safety Information

Extremely radioactive. Highly hazardous; no safe handling outside specialist research facilities.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Francium
Formula Fr
Molecular Weight 223
Category Elements

Frequently Asked Questions

Francium is a highly radioactive alkali metal and the second-rarest naturally occurring element. It occurs only as a decay product of actinium. Its chemistry resembles caesium, though its extreme instability means properties have been difficult to measure directly.

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