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1. The relative atomic mass of an element A is 16.2 u. There are two isotopes \(_{8}^{16}\textrm{A}\) and \(_{8}^{18}\textrm{A}\) of the elements. What will be the percentage of these two isotopes in the element A?
2. In which of the following the valency of each of the constituent elements is equal to the total number of atoms in one molecule of the compound?
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