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Nihonium is a synthetic chemical element with the symbol Nh and atomic number 113. It is extremely radioactive; its most stable known isotope, nihonium-286, has a half-life of about ten seconds. In the periodic table, nihonium is a p-block transactinide element. It is a member of the 7th period and is placed in group 13 on the periodic table, although it has not been confirmed to behave as the heavier homologue to thallium in that group.

Nihonium was first reported to have been created in 2003 by a Russian–American collaboration at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia, and in 2004 by a team of Japanese scientists at RIKEN.

Nihonium is calculated to have some similar properties to its lighter homologues, boron, aluminium, gallium, indium, and thallium, and behave as a post-transition metal like the heavier four, although it should also show several major differences from them.

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