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.

The average atomic mass of a sample of an element X is 16.2 u, what are the percentages of isotopes "_8^16X and "_8^18X in the sample?

The average atomic mass of a sample of an element X is 16.2 mu . What is the percentage of each isotope overset(18)underset(8)X and overset(18)underset(8)X in the sample?

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.

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