None. The Se2- ion is isoelectronic with Krypton.
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The noble gas that is isoelectronic with S2- is Argon. Both S2- and Argon have 18 electrons.
Yes, Cl^- is isoelectronic with a noble gas. Chlorine gains one electron to achieve the same electron configuration as argon, a noble gas.
None. However, the noble gas helium is isoelectronic with Li+ ion (and not with Li element)
Neon, Ne.
No noble gas is isoelectronic with the element chlorine. But argon is isoelectronic with the chloride ion.