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The table below shows the number of sub-atomic particles in an atom of sodium. Sub-atomic Particles Sub-atomic Particle Number Protons 11 Neutrons 12 Electrons 11 What is the amu of a sodium atom? 11 12 23 34

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Answer is: the amu of a sodium atom is 23.

The unified atomic mass unit (amu) is a standard unit of atom mass.

One unified atomic mass unit is approximately the mass of one nucleon (proton or neutron).

The unified atomic mass unit is equal 1.66·10⁻ÂČ⁷ kg.

n(pâș) = 11; number of protons in sodium atom.

n(n°) = 12; number of neutrons of sodium atom.

n(pâș + n°) = 11 + 12.

n(pâș + n°) = 23; number of nucleons in sodium atom.

the answer will be 23

hope i helped :)

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