Oxide ion O2- is isoelectronic with neon.
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Oxide ion (O2-) is isoelectronic with neon. Both species have the same number of electrons, which is 10.
Krypton is isoelectronic with a sulfur ion. Both have 18 electrons.
None. The Se2- ion is isoelectronic with Krypton.
The noble gas that is isoelectronic with an aluminum ion is neon. Both the aluminum ion (Al^3+) and neon have 10 electrons.
None. However, the noble gas helium is isoelectronic with Li+ ion (and not with Li element)