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    Hi guys

    Say you have a single hydrogen atom with its electron in its 1s orbital. Basically, is the phase of the orbital constant, or can it change? Because if I just don't really understand how an antibonding AND a bonding molecular orbital can be formed between two hydrogen atoms. If the orbitals are both of the same phase, and presumably CAN'T just switch phases, then why should an anti-bonding orbital arise? Similarly, if you have one in-phase and one out-of-phase, then why not JUST get an antibonding orbital. The thing is, I KNOW that two MOs are always produced when two atoms bond...I hope I've made myself clear, if not then I'll try again. But if anyone can understand that, and can help, I'd really appreciate it!

    Cheers, J
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    hmmm i want to know now, I done alevel chemistry and this wasn't taught to me. Like wth is an anti-bond. I'm watching this.
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    You're talking about He2 which would have both bonding and anti-bonding orbitals filled (so the diatomic species of helium is too unstable to exist, like you said). 2 1s electrons from each helium fill out the bonding and antil-bonding orbitals.

    Hydrogen however only has one 1s electron, and by the Aufbau principle the electrons are assigned to the lower energy orbitals first (which is the bonding orbital. Each orbital holds two electrons with paired spin. In H2 we have two electrons (one from each H atom) so only the bonding orbital is filled and voila, H2 can exist

 
 
 
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