atomic number 87 mass number 223 6 ธ.ค. 2568 — francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. It exists only in short-lived radioactive forms.
6 ธ ค 2568 francium Fr heaviest chemical element of Group 1 Ia in the periodic table the alkali metal group It exists only in short lived radioactive forms 6 ธ ค 2568 francium Fr heaviest chemical element of Group 1 Ia in the periodic table the alkali metal group It exists only in short lived radioactive forms Name Francium Symbol Fr Atomic Number 87 Atomic Mass 223 0 atomic mass units Number of Protons 87 Number of Neutrons 136 Number of Electrons 87 Francium 223 Hazard Class Radioactive material Placard Label s Radioactive Notes Atomic number 87 Reportable quantity 100 3 7 Curie Terabecquerels 6 ธ ค 2568 francium Fr heaviest chemical element of Group 1 Ia in the periodic table the alkali metal group It exists only in short lived radioactive forms
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Francium - Element information, properties and uses - Periodic Table
Reviewed in the Thailand on July 6, 2025
6 ธ.ค. 2568 — francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. It exists only in short-lived radioactive forms.
Name, Francium. Symbol, Fr. Atomic Number, 87. Atomic Mass, 223.0 atomic mass units. Number of Protons, 87. Number of Neutrons, 136. Number of Electrons, 87.
