the mass of single atom of an element is 1.99*10^23 .identity the element..
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Since 1 mole of atoms is 6.022×1023 atoms, so it means that the atomic mass of an element is numerically equal to the mass of its 6.022×1023 atoms. Thus, the atomic mass of the element X is 16 u. The element of atomic mass 16 u is oxygen, having the symbol O.12
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