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Why is UB₂ listed under uranium(II) compounds? Shouldn't it be one of:

• uranium(-VI), corresponding to [B⁺³₂U^-6 (but electronegativity!);
• uranium(X), corresponding to U⁺¹⁰[B^-5₂ (can relativity really justify donating >6 valence electrons?);
• uranium(VIII), corresponding to U⁺⁸(B^-4–B^-4) (same);
• uranium(VI), corresponding to U⁺⁶(B^-3=B^-3) (plausible, albeit high oxidation for a boron alloy); or
• uranium(IV), corresponding to U⁺⁴(B^-2≡B^-2) (my money's on this one)?

Uranium(II) only makes sense if the boron atoms are connected in a quadruple bond, and there is no evidence of first-row atoms making more than three bonds.

Bernanke's Crossbow ( talk) 22:01, 17 July 2023 (UTC) reply