1.

The use of ""^(12)Cscale has superseded the older scale of atomic mass based on ""^(16)O isotope, one important advantage of the former being

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the ATOMIC masses on `""^(12) C`scale became whole numbers
`""^(12)C`is more abundant in the earth's crust than `""^(16)O`
the difference between the physical and chemical atomic masses got narrowed down significantly
`""^(12)C`is SITUATED midway between METALS and non-metals in the PERIODIC table.

Solution :Physical atomic WEIGHTS are obtained by taking mass of 0-16 isotope as 16.00000. Chemical atomic weights are obtained by taking the average mass of the natural mixture of oxygen isotopes as 16.00000. Knowing the percentage (0-16,0-17, 0-18), the true mass is actually found to be 16.00447. Taking C-12 as the reference, the difference between two narrowed down.


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