(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.

Options

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

A