In the beginning God created radiation and ylem, And ylem was without shape or number, and the nucleons were rushing madly over the face of the deep.
And God said, "Let there be mass two." And there was was mass two. And God saw deuterium and it was good.
And God said, "Let there be mass three." And there was mass three. And God saw tritium and it was good.
And God continued to call numbers until He came to the transuranic elements. But when He looked back on his work, He found it was not good. In the excitement of counting, He missed calling for mass five, and so, naturally, no heavier elements could have been formed.