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The mass number of three isotopes of an ...

The mass number of three isotopes of an element are 10,12,14 units. Their percentage aboundance is 80,15 and 5 units respectively. What is the atomic weight of the element?

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Percentage abundances of lsotopes = 80, 15, 5 ratio of percentage abundances of Isotopes= 16 : 3 : 1
The total ratio= 16 + 3 + 1 = 20
`"Avg. Awt"=(sum"ratio of" % "abundance" xx "Atomic weight")/("Total ratio")`
`(10 xx 16 + 12xx3 + 14 xx 1)/(20)=10.5`
The Avg.Awt `=10.5`.
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NARAYNA-STRUCTURE OF ATOM-EXERCISE - IV EXEMPLAR PROBLEMS
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  5. Which of the following statements about the electron is incorrect?

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  7. Two atoms are said to be isobars is

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  9. Number of angular nodes for 4d orbtial is.........

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  11. Total number of orbitals associated with thrid shell will be.....

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