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Neon is isoelectronic with the sodium ion.
Na+ ion and neon are isoelectronic.
Both fluoride ion and sodium ion are isoelectronic with neon. That means all have 10 electrons.
Ions as Na+, Mg2+, Al3+ and N3- are isoelectronic; neon is an inert gas.
Na+ and neon are isoelectronic.
The Sulfide ion, S2-, is isoelectronic with Cl-
oxide ion is isoelectronic with neon.
Argon is isoelectronic with the sulfide ion.
Sodium monofluorophosphate is an ionic solid with a FPO32- ion which is approximately tetrahedral and isoelectronic with SO42-
Oxide ion O2- is isoelectronic with neon.
S2- ion is isoelectronic with argon (with 18 electrons).
The characterization of element for an atom or ion is determined solely by the number of protons in its nucleus, which remains the same in neutral atoms and in all ions of the element.