Here is a brief description of ununnilium. Element 110, ununnilium, is a synthetic element that is not present in the environment at all. Unlike these lighter atoms, element 110 decays after a small fraction of a thousandth of a second into lighter elements by emitting a -particles which are the nuclei of helium atoms.
Isolation Here is a brief summary of the isolation of ununnilium.
Pb, with one of nickel, Ni. This is because atoms of the element decompose through the emission of a -particles with a half life of only about 270 microseconds. Another isotope was made by using a different isotope of nickel.