We’re being asked to identify the species signified as X in the given nuclear transmutation reactions.
Nuclear transmutation is changing one nuclide (chemical element) or an isotope into another chemical element.
• A shorthand notation is used to represent nuclear transmutations lists the target nucleus, the bombarding particle and the ejected particle in parentheses, then the product nucleus.
Each of the following transmutations produces a radionuclide used in positron emission tomography (PET).
(i) 14N(p , α)X
(ii) 18O(p, X)18F
(iii) 14N(d, n)15O
In equation (i), identify the species signified as "X".