CHEMISTRY COMMUNITY

This question is primarily out of curiosity/for better understanding;
Are there molecular orbital diagrams for diatomic molecules involving transition metals or is the diagram constrained to diatomic molecules within the p- and s- orbitals?
Also, is the MO diagram constrained to diatomic molecules since there are only two columns for the atomic orbitals when they combine?

Great Question!
Homonuclear diatomic molecules are just H2 O2 F2 Br2 I2 N2 Cl2.
Heteronuclear diatomic molecules are much more diverse. However most of them to my knowledge are composed of non-metals. e.g. CO, NO+
Transition metals do not form diatomic molecules. They tend to bond to organic molecules to form organometallic complexes (like the coordination compounds we recently covered) or form lattices (like in minerals).
Molecular orbitals can certainly include more than two atoms. They can get very complicated! This is the molecular orbital diagram for a molecule called ferrocene. It is an iron atom sandwiched by two 5 membered carbon rings. https://lh4.googleusercontent.com/TANwJE0ki-RMcxNCQKGHkwoy_nr3Jmuslywae1iYOYlcBHxB9hVeRgsmorH4Ad1bcfjWv67k4v3wr4knoR989ElZiH60OYpJS0piiHwdp6WSGTDLJ1L5XLgjQO_4UqPQExY