The C–C distances in carbides of formula MC2 are in the range 119 to 124 pm if M is a Group 2 (IIA) metal or other metal commonly forming a 2+ ion, but in the approximate range 128 to 130 pm for Group 3 (IIIB) metals, including the lanthanides. Why is the C–C distance greater for the carbides of the Group 3 metals?
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