Power Plant Engineering
The mass number of a substance represents the sum of total number of

Protons and electrons in an atom
Neutrons and electrons in an atom
Protons and neutrons in an atom
Protons and neutrons in a nucleus

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Power Plant Engineering
Natural uranium is made up of

99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅
99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄
99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈
99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄

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