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Which of the following statements is not true about atomic mass?
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The atomic mass of an atom is obtained by taking sum of atomic masses of different isotopes of the element.
Atomic mass is a weighted average of all the
isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. It is also expressed relative to $\mathrm{C}^{12}$ isotope of carbon, also atomic mass of $\mathrm{Na}$ is 23 . Hence, option (c) not true and is the correct.
isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. It is also expressed relative to $\mathrm{C}^{12}$ isotope of carbon, also atomic mass of $\mathrm{Na}$ is 23 . Hence, option (c) not true and is the correct.
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