# Number of proton and neutron?

How to calculate c)?

Thanks

### 1 Answer

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- Steve4PhysicsLv 72 months agoFavorite Answer
Mass of neutron = mass of proton = 1.0u approx.

Total mass is 9.0u so there are 9 nucleons.

Since charge is 4e we know there are 4 protons.

Number of protons = 4

Number of neutrons = 9 - 4 = 5

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