Let \( u \) denote one atomic mass unit. One atom of an element of ...

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Let \( u \) denote one atomic mass unit. One atom of an element of mass number A has mass exactly equal to \( \mathrm{Au} \)
\( \mathrm{P} \)
(A) for any value of \( \mathrm{A} \)
(B) only for \( \mathrm{A}=1 \)
(C) only for \( A=12 \)
(D) for any value of A provided the atom is stable
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