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The atomic mass for Zn is given as 65.39 amu. Explain why there is no actual atom of zinc with an atomic mass of 65.39?

Answer :

amu stands for atomic mass unit. this is the approximate weight of one proton or neutron. since it is 65.39 you could not have an actual zinc atom that weighed 65 and 39/100s of an atomic particle. instead this number is the average weight of a bunch of zinc particles that differ in numbers of whole amu numbers.

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