Asked by Chem help

I do I figure out which bond is longest
a. C-F
b. C-N
c. Si-Se
d. C≡N
e. Si-Br

The answer is c. but I don't understand??? Please answer quick. Thanks.
Answered by bobpursley
Long bonds mean weak bonds, which occur between elements very close in the Periodic table.
Answered by Chem help
wait how is Si and Se closer to each other than C-N, they are right next to each other, and what about with double and triple bonds? Thanks.
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