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3 answers

uranium?

2007-12-13 10:16:52 · answer #1 · answered by Mr_In_Famous 2 · 0 0

235U and 239Pu both fit the bill.

2007-12-13 10:12:05 · answer #2 · answered by Facts Matter 7 · 0 0

plutonium?

2007-12-13 10:11:29 · answer #3 · answered by Anonymous · 0 0

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