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Estevao, thank you for your "mini-study"! And I agree with your conclusion. Unfortunately, Wolfram's data may be inconsistent even within itself – different data functions may provide different values for the same entity. E.g., when using functions...
As a consequence, it makes the existence of a hydrogen atom "computationally impossible": In[1]:= {mp, me} = (*masses of proton and electron*) UnitConvert[#, "AtomicMassUnit"] & /@ (Entity["Particle", #]["Mass"] & /@ {"Proton",...