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The use of ""^(12)C scale has supersede...

The use of `""^(12)C` scale has superseded the older scale of atomic mass based on `""^(16)O` isotope, one important advantage of the former being

A

the atomic masses on `""^(12) C` scale became whole numbers

B

`""^(12)C` is more abundant in the earth's crust than `""^(16)O`

C

the difference between the physical and chemical atomic masses got narrowed down significantly

D

`""^(12)C` is situated midway between metals and non-metals in the periodic table.

Text Solution

Verified by Experts

The correct Answer is:
C
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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