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Nuclear fission reactor questions? Chemistry AS Help?

A typical nuclear fission reactor contains a mix of uranium and plutonium isotopes, such as uranium-235 and plutonium-239.

Fill in the following:

Uranium-235:
Number of protons –
Number of neutrons –
Number of electrons – 92

Uranium-233
Number of protons –
Number of neutrons – 141
Number of electrons –

Plutonium-239
Number of protons – 94
Number of neutrons –
Number of electrons –

Plutonium-239 is present in nuclear reactors as the oxide, PuO2.

Calaculate the percentage by mass of plutonium in PuO2.

O, 16; Pu, 239