Are Antibonding Orbitals Empty?

Are Antibonding Orbitals Empty? Are antibonding orbitals empty? Below is a figure depicting this simple bond/anti-bond molecular orbital diagram that we had for hydrogen. The diagram also shows that electrons (in this case) completely fill the bonding orbital and leave the anti-bonding orbital empty. A common question is why would “anti-bonding” orbitals exist. Are antibonding