Not a neutral Cl atom but the chloride ion Cl- is isoelectronic with the noble gas argon.
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.
The noble gas that is isoelectronic with S2- is Argon. Both S2- and Argon have 18 electrons.
Helium is isoelectronic with nitrogen, as they both have 5 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).
Krypton is the noble gas isoelectronic with calcium, meaning they have the same number of electrons.
Neon, Ne.
No noble gas is isoelectronic with the element chlorine. But argon is isoelectronic with the chloride ion.
Magnesium element has no relation with noble gas. But Mg2+ ions and noble gas neon are isoelectronic.
[Rn] 5f6 7s2
Calcium and magnesium ions have electron configurations similar to that of neon, fluorine ions are similar to that of the noble gas neon, and iodine ions are similar to the noble gas xenon.
Krypton is isoelectronic with a sulfur ion. Both have 18 electrons.