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प्रश्न
Explain fractional atomic mass. What is the fractional mass of chlorine?
उत्तर
Atomic masses of the isotopes of chlorine are 35 and 37. However, in any given sample of chlorine gas, the isotopes occur in the approximate ratio 3:1, 75% of Cl35 and 25% of Cl37. So, the relative atomic mass or atomic weight of chlorine is 35.5.
Fractional atomic mass of chlorine
At. Mass = `(3(35) + 1(37))/2 = (105 + 37)/2`
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