When doing molecular orbitals the pi-bonds come before sigma for B2,C2, N2 and for O2,F2 and N2 the sigma bond comes first then the pi-bonds. Why does it happen?

When doing molecular orbitals the pi-bonds come before sigma for B2,C2, N2 and for O2,F2 and N2 the sigma bond comes first then the pi-bonds. Why does it happen?

Bestseller books online 101 Dog Tricks: Step by Step Activities to Engage, Challenge, and Bond with Your Dog Kyra Sundance, Chalcy  http://www.ebooknetworking.net/books_detail-1592533256.html

Bestseller books online 101 Dog Tricks: Step by Step Activities to Engage, Challenge, and Bond with Your Dog Kyra Sundance, Chalcy http://www.ebooknetworking.net/books_detail-1592533256.html

Dying Kitten Wasn’t Going To Survive, But Then She Met This Husky animals dogs cats pictures cool amazing story pets awesome great husky stories heart warming

Dying Kitten Wasn’t Going To Survive, But Then She Met This Husky animals dogs cats pictures cool amazing story pets awesome great husky stories heart warming

The way technology has made it possible to depict bonding is seriously so beautiful <3

The way technology has made it possible to depict bonding is seriously so beautiful <3

Detailed description of a pi bond.  Pi bonds are part of a double or triple bond system.

Detailed description of a pi bond. Pi bonds are part of a double or triple bond system.

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