How many neutrons are in ""^239 Pu239Pu?

1 Answer
Jun 4, 2016

There are 145145 neutrons in the ""^239Pu239Pu nucleus.

Explanation:

You specified elemental plutonium. Thus we know for a fact that ZZ == 9494. Since we have the mass number specified by the isotope notation, there are 239-9423994 massive, neutral particles in the plutonium nucleus.

To what does ZZ refer?