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# If bromine atom is available in the form of, say, two isotopes 79 35Br(49.7%) and 81 35Br(50.3%), calculate the average atomic mass of bromine atom. - CBSE Class 9 - Science

ConceptStructure of Atom Introduction

#### Question

If bromine atom is available in the form of, say, two isotopes ""_35^79Br (49.7%)" and """_35^81Br (50.3%), calculate the average atomic mass of bromine atom.

#### Solution

It is given that two isotopes of bromine are ""_35^79Br (49.7%)" and """_35^81Br (50.3%)

Then, the average atomic mass of bromine atom is given by:-

79xx(49.7/100)+81xx(50.3/100)

=3926.3/100+4074.3/100

=8000.6/100

= 80.006 u

= 80 u (approx)

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#### APPEARS IN

NCERT Solution for Science Textbook for Class 9 (2018 to Current)
Chapter 4: Structure of the Atom
Q: 10 | Page no. 55

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Solution If bromine atom is available in the form of, say, two isotopes 79 35Br(49.7%) and 81 35Br(50.3%), calculate the average atomic mass of bromine atom. Concept: Structure of Atom Introduction.
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