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[" 12.How do you know that nucleus is ve...

[" 12.How do you know that nucleus is very small as compared to the size of atom? (3) "],[" 13.The average atomic mass of a sample of an element "X" is "16.2u" .What are the "],[" percentages of isotopes "(16)/(8)X" and "(18)/(8)X?" (3) "]

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The average atomic mass of sample of an element X is 16.2 u. What are the percentages of isotopes ._(8)^(16)X and ._(8)^(18)X ?

The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes ._(8)^(16)X and ._(8)^(18)X in the sample.

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The atomic number of an element X is 16. (b) What will be the valency of X ?

A sample of an element X contains two isotopes ._(8)^(16)X and ._(8)^(18)X . If the average atomic mass of this sample of the element be 16.2 u, calculate the percentage of the two isotopes in this sample.