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An element has fractional atomic mass. W...

An element has fractional atomic mass. What does it indicate ?

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It means that the element is found to exist in a number of isotopes. In such cases average value is taken. For example chlorine exists in two isotopes with mass numbers 35 and 37 in the ratio of `3 : 1`. Hence, average relative atomic mass of chlorine `=(3 xx 35 + 1 xx 37)/(3+1) = 35.5` amu
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