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Molecular formula : MW : CAS :
nature : Periodic System III, vice ethnic communities actinide elements. An artificial radioactive elements. Atomic number 97. There are 11 species of isotopes. Amu 247.0703. The longest half-life of 247Bk (1380). Pei with two allotropism (α and β). Melting point 986 ° C ± 22 ° C. Chemical properties and lively. Prices are +3 and +4 compounds. Pei is used in helium ion cyclotron bombarded americium 241 and prepared. Pei found for the other heavier elements found is of special significance.
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