The elements 1 5 16 39 42 68 92 = what other two elements w/ nuclear fission?

Question

(H B S Y Mo Er U)

Answer 1

It is impossible for hydrogen to undergo nuclear fission, as it has only one nucleon (unless you include Tritium).

In fact, IEM, who publishes the most extensive list of half-lives I've come across so far, has no listing for Boron, only one for Sulfur, 1 for Ytterbium, 2 for Molybdenum, 4 for Europium, and 8 for Uranium.

On the other hand, every element has at least one isotope which will undergo fission decay.