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Reference.org
Allotropes of plutonium
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<p><a href="/facts/Plutonium/4bUw9zH3">Plutonium</a> occurs in a variety of <a href="/facts/Allotropy/2WUdHWxg">allotropes</a>, even at ambient pressure. These allotropes differ widely in <a href="/facts/Crystal_structure/bJ4bCeHd">crystal structure</a> and density; the α and δ allotropes differ in density by more than 25% at constant pressure. </p>