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Reference.org
Kryptonium ion
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<p>The kryptonium ion, KrH+, is an <a href="/facts/Onium_ion/92qxuw9q">onium ion</a>, consisting of protonated <a href="/facts/Krypton/llkNlCke">krypton</a>. Kryptonium is known in dilute gas phase. Although salts of the fluorokryptonium ion, KrF+, are known to exist, the existence of the kryptonium salts have not been proven. </p>