The element x occurs naturally to the extent of 200
The element X occurs naturally to the extent of 20.0% superscript 12X and 80.0 % superscript 13X. The atomic mass of X is nearest:
a) 12.2
b) 12.5
c) 12.8
d) 13.0
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the element x occurs naturally to the extent of 200 superscript 12x and 800 superscript 13x the atomic mass of x is
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