Final answer:
There are four studied types of chemical bonds: covalent (polar and non-polar), ionic, metallic, and hydrogen bonds.
Step-by-step explanation:
The student asked how many types of chemical bonds exist that we had studied. The correct answer is four. These include covalent bonds (which can be non-polar or polar), ionic bonds, metallic bonds, and hydrogen bonds. Polar and non-polar covalent bonds involve the sharing of electrons between atoms. Ionic bonds occur when electrons are transferred from one atom to another. Metallic bonds are found in metals where electrons are free to move throughout the metal structure. Lastly, hydrogen bonds are a special type of attraction that occurs between a hydrogen atom in one molecule and a more electronegative atom in another molecule.