Chlorine's atomic mass is represented in decimals because it has two isotopes present , but many other elements also have their isotopes in nature so why arent their atomic masses represented in decimals?

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Solution

Atomic mass is the average of all the isotopes of the element. Usually all the elements atomic mass is calculated in the same way and the decimal figures are rounded off.

But the naturally occurring isotopes of chlorine Cl 35 (75.77%) and Cl 37(24.23%) are relatively present in the ratio 3:1 quite large amount than other elements, hence giving chlorine atomic mass 35.45 approximately 35.5.

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,
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