If bromine atom is available in the form of, say, two isotopes ${}_{35}^{79}{Br}$ (49.7%) and ${}_{35}^{81}{Br}$ (50.3%), calculate the average atomic mass of bromine atom.

Solution

Isotope of bromine with atomic mass 79 u = 49.7%

So, Contribution of 79 Br to atomic mass of bromine = $79 x \frac{49.7}{100} = 39.26 u$

Isotope of bromine with atomic mass 81 u = 50.3%
therefore, Contribution of 81 Br to atomic mass of bromine = $81 x \frac{50.3}{100} = 40.74 u$

Hence, atomic mass of bromine atom = 39.26 + 40.74 = 80.0 u

Some More Questions From The Fundamental Unit of Life Chapter

Compare the properties of electron, proton and neutron.

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The Fundamental Unit Of Life

If bromine atom is available in the form of, say, two isotopes ${}_{35}^{79}{Br}$ (49.7%) and ${}_{35}^{81}{Br}$ (50.3%), calculate the average atomic mass of bromine atom.

Some More Questions From The Fundamental Unit of Life Chapter

Compare the properties of electron, proton and neutron.

What are the limitations of J.J. Thomson’s model of atom?

What are the limitations of Rutherford model of the atom?

Describe Bohr's model of the atom ?

Compare all the proposed models of an atom given in this chapter.

Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.

Define valency by taking examples of silicon and oxygen.

Explain with examples, (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars. Give any two uses of isotopes also.

Na⁺ has completely filled K and L-shells. Explain.

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NCERT Sample Papers

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For Daily Free Study Material Join wiredfaculty

The Fundamental Unit Of Life

If bromine atom is available in the form of, say, two isotopes Br3579 (49.7%) and Br3581 (50.3%), calculate the average atomic mass of bromine atom.

Some More Questions From The Fundamental Unit of Life Chapter

Compare the properties of electron, proton and neutron.

What are the limitations of J.J. Thomson’s model of atom?

What are the limitations of Rutherford model of the atom?

Describe Bohr's model of the atom ?

Compare all the proposed models of an atom given in this chapter.

Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.

Define valency by taking examples of silicon and oxygen.

Explain with examples, (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars. Give any two uses of isotopes also.

Na+ has completely filled K and L-shells. Explain.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

If bromine atom is available in the form of, say, two isotopes ${}_{35}^{79}{Br}$ (49.7%) and ${}_{35}^{81}{Br}$ (50.3%), calculate the average atomic mass of bromine atom.

Na⁺ has completely filled K and L-shells. Explain.