Name: ununnilium
Symbol: Uun
Atomic number: 110
Atomic weight: [ 269 ]
Group in periodic table: 10
Group name:
Period in periodic table: 7
Block in periodic table: d-block
CAS registry ID: 54083-77-1
Element 110, ununnilium, is a synthetic element that is not present in the environment at all.
Chemically, the element 110 is in the same Group as nickel, palladium, and platinum (Group 10). 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.