Noble gases are notorious for their extreme disinterest in bonding with other elements. For this reason, scientists have had to work hard to force gases such as argon into stable compounds (SN: 8/26/00, p. 132).
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Scientists have now created a compound containing argon and uranium–by accident no less. It’s the first-ever compound containing both a noble gas and one of the periodic table’s so-called actinide elements.