Determination of atomic and isotopic mass - class-XI

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Question 1 of 15

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:

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$66.6\%$

$96.7\%$

$6.67\%$

$33.3\%$

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