Power Plant Engineering
Natural uranium is made up of

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

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Power Plant Engineering
Isotopes of same elements have

Different masses and different atomic numbers
Same chemical properties but different atomic numbers
Different chemical properties and same atomic numbers
Same atomic number and different masses

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