Russian scientists say they've successfully repeated their synthesis of the 117th chemical element, paving the way for formal addition to the periodic table.

The Joint Institute for Nuclear Research in Dubna outside Moscow first synthesized the 117th element in 2010, but the International Union of Pure and Applied Chemistry requires such experiments to be reproduced before registering a new element.

The researchers have already filed an application to register the new element, Andrei Popeko, an official at the Dubna institute, told RIA Novosti Monday.

However, obtaining a proper name and formally adding it to the periodic table could take up to a year, Popeko said.

Elements beyond uranium, No. 92 in the periodic table, do not occur in nature and have to be artificially created in reactors or laboratories.

The Dubna Institute said it has already synthesized element 118, while a German research center is working to synthesize elements 119 and 120, RIA Novosti reported.