Assertion [A]: Atomic weights of most of the elements are not whole numbers. |
Reason (R): Atoms of most of the elements contain mixture of isotopes having different atomic weights. |
A) Both A and R are individually true and R is the correct explanation of A
B) Both A and R are individually true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false but R is true
Correct Answer: A
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