Single Choice

If u denotes $$1$$ atomic mass unit. One atom of an element has mass exactly equal to $$Au$$, where $$A$$ is mass number of element.

A$$A = 1$$
B$$A = 12$$
Correct Answer
C$$A = 16$$
D$$A$$ can take up any integral value from $$ 1$$ to $$110$$

Solution

By definition, Atomic Mass Unit is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state, and has a value of $$1.66053892110^(27)$$ kg.
Hence, $$A= 12$$ for Carbon

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