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Question

Atomic mass of an element is not a whole number because:

A

it contains electrons, protons and neutrons

B

it contains isotopes

C

it contains allotropes

D

all of the above

Medium

Solution

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Correct option is
B

it contains isotopes

Atomic mass of an element is not a whole number because It contains isotopes.
For example, chlorine has two isotopes and with natural abundances in the approximate ratio of 3:1. Hence, the average atomic mass of chlorine is approximately 35.5 g/mol.

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