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Chlorine exists in two isotopic forms $\mathrm{Cl}-37$ and $\mathrm{Cl}-35$, but its atomic mass is $35.5$. This indicates the ratio of $\mathrm{Cl}-37$ and $\mathrm{Cl}-35$ is approximately
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$1: 3$
$1: 3$
The fractional atomic mass $(35.5)$ of chlorine is due to the fact that in ordinary chlorine atom, $\mathrm{Cl}-37$ and $\mathrm{Cl}-35$ are present in the ratio of $1: 3$.
$\therefore$ Average atomic mass of $\mathrm{Cl}$
$=\frac{3 \times 35+1 \times 37}{4}=35.5 \mathrm{~amu}$
$\therefore$ Average atomic mass of $\mathrm{Cl}$
$=\frac{3 \times 35+1 \times 37}{4}=35.5 \mathrm{~amu}$
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