Nuclear Power Engineering
The atomic mass of an element is fractional, because

Of uncertainty principle
It contains neutrons
It may have isotopes
It may have isobars

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Nuclear Power Engineering
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

Melting point, hence can be subjected to higher temperature
Resistance to effects of irradiation
Density ; hence core volume for a given power output would be smaller
All of these

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