In the nuclear transmutation, ⁹⁴Be + X → ⁸⁴Be + Y, X and Y are:

In the nuclear transmutation, ⁹⁴Be + X → ⁸⁴Be + Y, (X, Y) are either (γ,n) or (p,D). In the given nuclear equation, the atomic number on LHS = the atomic number on RHS. Hence, the atomic number of X and Y should be equal.