(Ar) Argon because Ca ion is Ca2+ so it give away 2 electrons
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Krypton is isoelectronic with a calcium ion, as both have 36 electrons. Calcium loses 2 electrons to form a 2+ cation, which results in it having the same electron configuration as krypton.
Krypton is the noble gas that is isoelectronic with Calcium. Both elements have 20 electrons, with Calcium having the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 and Krypton having the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10.
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 the oxide ion O2 is neon (Ne). Both the oxide ion O2 and the neon atom have 10 electrons.
The noble gas that is isoelectronic with an aluminum ion is neon. Both the aluminum ion (Al^3+) and neon have 10 electrons.