Sigma Bonding


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904914037
Posts: 65
Joined: Wed Sep 18, 2019 12:16 am

Sigma Bonding

Postby 904914037 » Sat Nov 23, 2019 7:03 pm

Can someone please explain why only the 2pz orbital can form sigma bonds whereas the 2px and 2py orbital cannot? Does this just have to do with the orientation of the orbitals? Thank you!

Ethan Lam 4A
Posts: 69
Joined: Thu Jul 11, 2019 12:17 am

Re: Sigma Bonding

Postby Ethan Lam 4A » Sat Nov 23, 2019 7:27 pm

The 2px and 2py orbitals cannot form sigma bonds because the 2pz took up the only spot for the sigma bond. This is because the sigma bond is between the atoms while the pi bond is on the side. Thus, the 2px and 2py orbitals form bonds along the sides of the atom.

Wilson 2E
Posts: 100
Joined: Sat Aug 17, 2019 12:18 am

Re: Sigma Bonding

Postby Wilson 2E » Sat Nov 23, 2019 11:15 pm

When the book talks about the 2pz orbital as being the only one able to form a sigma bond, it only means with respect to the z axis. Since 2pz is the only orbital directly along the z axis, the 2px and 2py orbitals, if they are involved through double or triple bond, form pi bonds. However, the 2px and 2py can form additional sigma bonds but the atom they bond to will be along the x or y axis, not the z axis.


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