Posted by **Benny** on Thursday, February 8, 2007 at 9:37pm.

Plutonium-239 is used in nuclear bombs. Determine the number of protons and neutrons in plutonium-239.

I really don't understand this. Can someone tell me how to do this?

thanks

What is the atomic number of Pu? Look it up on the periodic table...that is the number of protons. Number of neutrons= atomic mass 239 minus atomic number.

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