1) Nihonium 2) Uut 
Ununtrium is the temporary name of a chemical element with the temporary symbol Uut and atomic number 113. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); its most stable known isotope, ununtrium-286, has a half-life of 20 seconds. It is also known as eka-thallium or sim...
Uut noun a radioactive transuranic element