What are the exceptions to the periodic trends in ionization energy? check all that apply. check all that apply. exceptions occur with elements li, na, and k in group 1a and elements be, mg, and ca in group 2a. exceptions occur with elements be, mg, and ca in group 2a and elements b, al, and ga in group 3a. exceptions occur with elements b, al, and ga in group 3a and elements c, si, and ge in group 4a. exceptions occur with elements c, si, and ge in group 4a and elements n, p, and as in group 5a. exception occurs with elements n, p, and as in group 5a and elements o, s, and se in group 6a exception occurs with elements o, s, and se in group 6a and elements f, cl, and br in group 7a exception occurs with elements f, cl, and br in group 7a and elements ne, ar, and kr in group 8a