element 115

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element 115: see ununpentium ununpentium, artificially produced radioactive chemical element; symbol Uup; at. no. 115; mass number of most stable isotope 288; m.p., b.p., sp. gr., and valence unknown.
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synthetic elements
ununpentium

ununtrium

Each of those putative atoms of element 115 disintegrated within fractions of a second by spontaneously ejecting an alpha particle, which contains two protons and two neutrons.

Two new elements made: atom smashups yield 113 and 115 by Weiss, P. / Science News

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