Not a neutral Cl atom but the chloride ion Cl- is isoelectronic with the noble gas argon.
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Yes, Cl^- is isoelectronic with a noble gas. Chlorine gains one electron to achieve the same electron configuration as argon, a noble gas.
The noble gas that is isoelectronic with S2- is Argon. Both S2- and Argon have 18 electrons.
None. However, the noble gas helium is isoelectronic with Li+ ion (and not with Li element)
None. The Se2- ion is isoelectronic with Krypton.
Sodium (Na) is in Group 1 of the periodic table and has one valence electron, similar to the noble gas configuration of helium (He). Chlorine (Cl) gains one electron to achieve a stable electron configuration, resembling the noble gas configuration of argon (Ar).
Neon, Ne.