Structural Isomers: In the next part you will learn a little about structural isomers and how to draw them. Structural isomers are compounds the same molecular formula, but different bonding arrangements or connectivities. In other words, the atoms are connected in a different orde example, there are 2 different compounds with the molecular formula C4H10. They are given below: Do you see how the atoms are bonded in a different order in the 2 structures? So they are structural isomers