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Question

Bromine atom is available in two isotopes, 7935Br (49.7%) and 8135Br (50.3%), the average atomic mass of bromine atom is :

A
79.016
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B
80.076
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C
80.006
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D
81.016
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Solution

The correct option is

C

80.006

The average atomic mass is the average mass of the atoms in the naturally occurring sample of the element. The average atomic mass of an element is the sum of the mass of its isotopes each multiplied by its natural abundance.

It is given that two isotopes of Bromine are 79/35 Br(49.7%) and 81/35 Br(50.3%). Then, the average atomic mass of the Bromine atom is given by

Avg Atomic Weight = 79×49.7100+81×50.3100 = 80.006


Option C is correct

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