Question

what is relative atomic mass of electron give detail​

Answer 1

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a relative atomic mass (symbol: Ar) is a ratio with no units. A relative atomic mass is the ratio of the average mass per atom of an element from a given sample to 1/12 the mass of a carbon-12 atom.

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Answer 2

0.0005u

u means unified mass

and value of u is 0.665x10 to the power -17g