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An element of atomic weight Z consists o...

An element of atomic weight Z consists of two isotopes of mass number (Z-1) and (Z+2). Calculate the % of higher isotope.

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Let the % of higher isotope [mass number (Z+2)] is x. hence other isotope [mass number (Z-1)] will be (100-x)
Average atomic wight `(Z)=(x(Z+2)+(100-x)(Z-1))/(100) `
or, `100Z=Zx+2x+100Z-100-Zx+x`
or, `3x=100" or, "x=33.33%`
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