The modern atomic mass unit is based on the mass of :

C-12 isotope

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hydrogen

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oxygen

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nitrogen

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Solution

The correct option is A C-12 isotope
One a.m.u. or one 'u' is equal to $1.66053892 10^{- 24} g$ or $1.66053892 10^{- 27} k g$ . It is equal to $\frac{1}{12}$ of the mass of an atom of carbon-12.
It is used as a standard. The masses of all other atoms are determined relative to the mass of an atom of carbon-12.

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Similar questions

^{12} C

\frac{1}{12}

One atomic mass unit is a mass unit equal to exactly one twelfth (1/12^th) the mass of one atom of ___________.

= 1.992 \times 10^{- 23}

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