Atomic weight of calcium is 40. It means that
1) one calcium atom is 20 times heavier than 12th of C-12 atom
2) one calcium atom is 40 times heavier than '/12th of C-12 atom
3) one calcium atom is 40 times heavier than C-12 atom
4) None
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2 option is correct answer
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one calcium atom is 40 times heavier than 1/12th of C-12 atom
will be the answer
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