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I have a bridging hydroxyl group between two metals, so the oxygen is triply coordinated in this structure.

How do I change the valency to three in Avogadro so that these bonds to the metal are displayed?

Perhaps it might be necessary to also play around with the van der Waals radius. Or is there a direct way to enforce a drawn bond between two atoms?

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    $\begingroup$ I'll point out that there's a discussion forum particularly for Avogadro questions... $\endgroup$ – Geoff Hutchison Sep 22 '16 at 21:02
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While there are some automatic valence features in Avogadro, you can always turn them off. Bonding is mostly a matter of appearance.

For example, let's import $\ce{IF7}$.

enter image description here

Notice that the central iodine doesn't show enough bonds. So we'll draw some in. Switch to the draw tool and turn "Adjust Hydrogens" off.

enter image description here

Now just draw connections between the atoms. Voila!

enter image description here

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  • $\begingroup$ After using it now several times, I have to say it is a very intutive way of doing it. Thank you very much! $\endgroup$ – mcocdawc Oct 2 '16 at 10:05

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