97-berkelium
Isotopes:
Bk-235 Bk-236 Bk-237 Bk-238 Bk-239 Bk-240 Bk-241 Bk-242 Bk-243 Bk-244 Bk-245 Bk-246 Bk-247 Bk-248 Bk-249 Bk-250 Bk-251 Bk-252 Bk-253 Bk-254

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