The mass of a neutral carbon atom- a specimen of the most common isotope- in ground state is- equal to 12 u-less than 12 u-more than 12 u-Depends on the allotrope- whether it is graphite- charcoal or diamond-

The correct option is A equal to 12 u The unified atomic mass unit, 'amu', is defined as '1/12^th of the mass of a neutral Carbon 12 in its lowest energy state ...

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Standard IX

Physics

Nucleus: Common Terms

The mass of a...

Question

The mass of a neutral carbon atom, a specimen of the most common isotope, in ground state is:

equal to 12 u

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less than 12 u

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more than 12 u

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Depends on the allotrope, whether it is graphite, charcoal or diamond.

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Solution

The correct option is A
equal to 12 u

The unified atomic mass unit, 'amu', is defined as ' ${\frac{1}{12}}^{t h}$ of the mass of a neutral Carbon-12 in its lowest energy state which contains six protons, six neutrons and six electrons.' So, by definition, a Carbon-12 atom in ground state has a mass of exactly 12 amu.

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