La tennessina es lo nom d’un element quimic, de simbòl Ts e de numèro atomic 117.
L’element 117 foguèt observat al Flerov Laboratory of Nuclear Reactions (FLNR) del Joint Institute for Nuclear Research a Dobna en Russia en projectant d’ions de calci 48 sus una cibla de berkèli 249 per produsir los nucleïds 293117 e 294117:
Apelat provisòriament ununsèpti, se recebèt lo nom en l’onor de l’estat de Tennessee.
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