write the iupac name and symbol Atomic no149
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No such element is present with atomic number 149 but theoretically it exists with the name of Avogadrium and symbol as Av.
Following the IUPAC nomenclature rules, it can be written as : Unquadennium( symbolised as Uqe).
Avogadrium is the non-systematic name of this theoretical element and has been named after Amedeo Avogadro( the one who determined the Avogadro's constant).
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