Editing Extended periodic table (section)

==== Unbipentium (E125) <span class="anchor" id="Unbipentium"></span> ====
The first and only attempt to synthesize element 125 (unbipentium) was conducted in Dubna in 1970{{endash}}1971 using [[zinc]] ions and an [[americium-243]] target:<ref name=superlourds/>

:{{nuclide|americium|243}} + {{nuclide|zinc|66, 68}} → <sup>309, 311</sup>125* → no atoms

No atoms were detected, and a cross section limit of 5 nb was determined. This experiment was motivated by the possibility of greater stability for nuclei around ''Z''&nbsp;~&nbsp;126 and ''N''&nbsp;~&nbsp;184,<ref name=superlourds/> though more recent research suggests the island of stability may instead lie at a lower atomic number (such as [[copernicium]], ''Z'' = 112), and the synthesis of heavier elements such as element 125 will require more sensitive experiments.<ref name=Zagrebaev/>