Question

The atomic mass of an element is usually fractional because:
(i)Elements contain impurities (ii) Elements are mixture of isotopes
(iii) Elements are mixture of allotropes (iv) Elements are mixture of isobars​

Answer 1

Answer:

Elements are mixtute of isotopes

Explanation:

As most of the elements have isotopes

we have to consider them also

because some isotopes are very less abundunce but some have fairly more

although these isotopes are an element it has its own mass so to calculate the mass of the element average atomic mass should be calculated such that it include mass isotopes also

hope that it helps

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