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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Chemistry: The element x occurs naturally to the extent of 200
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