This is a category for elements that are too heavy to be stable synthethized elements.
“Biunennium is the 219th element in the extended periodic table. It is a hypothethical element...Biunennium
“Bibinillium is a predicted radioactive alkaline earth metal and is the 220th element in the...Bibinillium
“Bibiunium is the hypothethical 221st element in the periodic table. It is a superheavy element.Bibiunium
“A Transuranium element is an element that comes after uranium, such as neptunium, 119...Transuranium element
“Californium is a radioactive metallic chemical element with symbol Cf and atomic number 98. The...Californium