D001603Level 6

Berkelium

**Definition:** A man-made radioactive actinide with atomic symbol Bk, atomic number 97, and atomic weight 247. Its valence can be +3 or +4. Twelve isotopes have been produced with mass numbers 240-251.

**Tree numbers:** - D01.268.271.100.100 - D01.268.556.075 - D01.496.749.305.100.100 - D01.552.020.150 - D01.552.544.075

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