Using monocrystal elastic constants and Blackman diagrams, one can infer material interconnections, physical-property trends, and knowledge about interatomic bonding. After reviewing briefly the f.c.c.-metal case, focus shifts to Ce, Pu, Th, with known monocrystal f.c.c. elastic constants, the Cij. For U and a few other lanthanide-actinide cases, one can deduce the f.c.c. Cij. From these results, for the lanthanides-actinides, there follow several conclusions: (1) elastic anisotropy varies widely; (2) Poisson ratios are low; (3) interatomic bonding varies widely; (4) against all other f.c.c. metals, all show unusual negative Cauchy pressures (three-body forces); (5) a strong covalent-bonding component occurs, perhaps related to localized (or semilocalized) f-electrons; (6) delta-plutonium behaves most oddly; (7) delta-plutonium may share some bonding features with alkali metals.

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