Stable molecules with more than four bonding atoms are relatively rare, as the majority of stable molecules tend to follow the octet rule, which states that atoms tend to gain, lose, or share electrons in a way that gives them a stable electron configuration with eight valence electrons.
Nevertheless, there are a few examples of stable molecules that have more than four bonding atoms or exhibit multiple quadruple or quintuple bonds. Here are a few examples:
Ozone (O3): Ozone is a molecule composed of three oxygen atoms. It has a bent molecular geometry and consists of one double bond and one coordinate bond between the oxygen atoms.
Sulfur hexafluoride (SF6): SF6 is an example of a molecule that contains multiple bonds and more than four bonding atoms. It consists of one sulfur atom bonded to six fluorine atoms through six single bonds.
Phosphorus pentachloride (PCl5): PCl5 is a molecule that contains one phosphorus atom bonded to five chlorine atoms. It has a trigonal bipyramidal molecular geometry and consists of one phosphorus-chlorine triple bond and three phosphorus-chlorine single bonds.
Sulfur dioxide (SO2): Although sulfur dioxide has only four bonding atoms, it is worth mentioning as it has a resonance structure with a double bond between sulfur and one oxygen atom and a coordinate bond between sulfur and the other oxygen atom. This resonance contributes to the stability of the molecule.
It's important to note that these examples do not feature multiple quadruple or quintuple bonds, as those types of bonds are highly unusual due to the energetic requirements and the lack of available atomic orbitals to form such bonds.