Do f - block elements form interstitial compounds ?

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Wile E. Coyote (1724)

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Yess....dey do form...non-stoichiometric interstitial hydrides are formed by the 'f' block elements (i.e. lanthanides and actinides). These hydrides have lower densities than their respective metals, e.g. LaH₂_.₇₆, CeH₂_.₆₉, TbH₃_.₀₇ _.