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(A) The position of an element an element in periodic in table after emission of one `alpha` and two `beta`-partilce remians unchanged. (R ) Emission of one `alpha` and two `beta` particles gives isotope of the parent element which acquires same position in the periodic table.A. If both (A) and (R ) are correct and (R ) is the correct explanation for (A).B. If both (A) and (R ) are correct but (R ) is not the correct explanation for (A )C. If both (A) and (R ) are incorrect.D. If both (A) and (R ) are incorrect.

Answer» Correct Answer - A


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