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Question: Answered & Verified by Expert
Which of the following statements is not true about atomic mass?
ChemistryStructure of AtomTS EAMCETTS EAMCET 2020 (09 Sep Shift 2)
Options:
  • A The atomic mass of an element is expressed relative to ${ }^{12} \mathrm{C}$ isotope of carbon.
  • B Atomic mass of $\mathrm{Na}$ is 23 .
  • C The atomic mass of an atom is obtained by taking sum of atomic masses of different isotopes of the element.
  • D Atomic mass used for an element is the average atomic mass obtained by taking into account the natural abundance of different isotopes of that element.
Solution:
2289 Upvotes Verified Answer
The correct answer is: 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.

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