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     EduGorilla 
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    Boron found in nature having atomic weight of 10.811 and is made up of the isotopes B10 (mass 10.013 amu) and isotope B11 (mass 11.0093). What percentage of naturally occurring boron is made up of B10 and B11 respectively?

    Options :-

    1. 30:70

    2. 25:75

    3. 20:80

    4. 15:85

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