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Trends in bond energy

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Edit: thread moved by mod from non technical forum, hence lack of the template.

Using arguments from MO theory, state why the trends in homonuclear bond energies for rows 1 and 3 of the periodic table in graph D differ so markedly.

Screen Shot 2016-05-20 at 18.08.01.png
S
State, with reasons, whether Si or Ge has the higher electronegativity

So I know that the bond energies in general tend to increase across the period as the atoms get smaller and there is better orbital overlap. I also understand that N/O/F have extra repulsion dues to the fact that π* orbitals are more anti bonding than π orbitals are bonding due to asymmetry in the MO diagrams so they are all weaker than expected. However why is this effect only seen in row 1 and not in row 3?
 

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Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
 

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