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Ethenium
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<p>In <a href="/facts/Chemistry/SrNqkGVm">chemistry</a>, ethenium, protonated ethylene or ethyl cation is a <a href="/facts/Cation/wrbwhF3z">positive ion</a> with the formula C2H+5. It can be viewed as a molecule of <a href="/facts/Ethylene/QMNBYLYn">ethylene</a> (C2H4) with one added proton (H+), or a molecule of <a href="/facts/Ethane/BGCzc6yh">ethane</a> (C2H6) minus one <a href="/facts/Hydrogen_anion/xIVhqHj5">hydride ion</a> (H−). It is a <a href="/facts/Carbocation/vIggUxTh">carbocation</a>; more specifically, a nonclassical carbocation. </p>