Statement (A) : The mass number of Oxygen is 16.
Statement (B) : The mass number of Calcium is 40.
Statement (C) : The mass number of Copper is 63.5

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A and B are correct but C is incorrect

All the above statements are incorrect

All the above statements are correct

A and B are incorrect but C is correct

answer is A.

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Detailed Solution

For an atom of element mass number A should be equal to sum of the no. of protons and neutrons present in the nucleus. Hence, A=p+n;

Hence mass number of an element should be positive integer

For oxygen(Z= 8), mass no. A = 16

For calcium(Z =20) mass no. A = 40

For copper (Z 29 = ), mass no. A= 63.5

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