Long time ago there was some diagram showing inner energy ballance in different atoms nuclei.
Iron 56 is at the bottom of the curve, which means, over very long timespan elements lower than iron
will gain protons and neutrons, elements above iron will lose them.
Orbiting electrons will come and go with protons.
Tried to find by Google where I saw it.
Meanwhile, found this:
"In 10
1500 years, cold fusion occurring via quantum tunnelling should
make the light nuclei in ordinary matter fuse into iron-56 nuclei (see isotopes of iron).
Fission and alpha-particle emission should make heavy nuclei also decay to iron,
leaving stellar-mass objects as cold spheres of iron, called iron stars."
From:
Future of an expanding universe.