Bond length

[IreneSeo3F]

How do you calculate the average bond length in a molecule when given the bond length of each atom?

[Akash J 1J]

Bond length is the sum of the radius of the two component atoms.
Eg. the bond length of H-O in H2O is the (radius of H) + (radius of O).
I'm not sure what you mean by average bond length, but maybe you are referring to the bond lengths in resonance structures. In resonance structures, the bonds "share the load" so the bond lengths end up being a sort-of average of the bonds that are part of the resonance.

[Javier Perez M 1H]

That is true, bond length relies on center to center distance. However, bonds also decrease these lengths theoretically when bonding more than once.

[kateraelDis1L]

I remember doing a problem that asked for bond lengths and we got to the answer by adding up two given bonds lengths to make the whole coordinate covalent bond. if you're referring to the question on the final, I think we had to decide whether the bonded atoms were held together with either single or double bonds, and then add them accordingly. Can anyone confirm or deny this? I was confused on this concept as well.

[Melanie Krahn 1C]

Is the radius of an atom something we would have to know off of the tp of our heads or is there some way to calculate/gauge that?

[205323697]

Would it take more energy to break a long or short bond length?

[Nina Ellefsen 2D]

Would it take more energy to break a long or short bond length?

it would take more energy to break a short bond :)

[Nicole Bruno Dis 1B]

Bond length is determined by the number of bonded electrons (the bond order). The higher the bond order, the stronger the pull between the two atoms and thus the shorter the bond length. Generally, the length of the bond between two atoms is approximately the sum of the covalent radii of the two atoms.

[Riya Sawhney 1C]

The length of a bond is determined by the number of electrons participating in the bond, aka the amount of bonds. The more bonds between two elements, the stronger the bond, and therefore the elements are closer, meaning the bond length is shorter.

[Benicio Rivera 1F]

Count the total number of bonds. Count the number of bond groups between individual atoms. Divide the number of bonds between atoms by the total number of bond groups in the molecule.