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Determination of atomic and isotopic mass - class-XI

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Multiple Choice

There are two isotopes of an element with atomic mass $z$. Heavier one has atomic mass $z+2$ and lighter one has $z-1$, then an abundance of lighter one is:

  1. $66.6\%$
  2. $96.7\%$
  3. $6.67\%$
  4. $33.3\%$
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