1. Incorrect. The answer is true not false. Transition elements have atomic numbers between 21 and 30 or between 39and 48 or between 72 and 80 or between 104 and 112. Alternatively, describing T by the roster method gives the list of the elements:

T = {Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Rf, Db, Sg, Bh, Hs, Mt, Uuu, Uub}