D005605Level 5

Francium

**Definition:** A radioactive alkali metal with the atomic symbol Fr, and atomic number 87. The mass numbers of known isotopes are 204-213, 217-224. Its valence is +1.

**Tree numbers:** - D01.268.271.380 - D01.268.549.250 - D01.268.556.277 - D01.496.749.305.380 - D01.552.528.328 - D01.552.544.277

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