Ozone is a molecule, and not what I'm looking for. (And to answer your question, [X]3 is a pretty rare structure, because the bonds have to be seriously strained to form it. Oxygen can only pull it off because oxygen is desperate to combine with literally anything.)
Galadriel55, that Lanthanum joke is terrible - I wish I'd thought of it! (Also not right.)
The triple element is named after a person - a real person, not a mythological figure. You can see what makes it triple right there on any decent periodic table. And it may help you to think like a Roman (though it may also utterly confuse you; it often does!).
hS
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