Final answer:
When two or more of the same type of atoms are joined together, they form a molecule such as diatomic molecules like hydrogen (H₂) or oxygen (O₂), bonded by covalent bonds. Molecules with different types of atoms, like water (H₂O) or methane (CH₄), are known as chemical compounds.
Step-by-step explanation:
When two or more of the same type of atoms are joined together, the result is a molecule composed of those atoms. An example of molecules that consist of the same type of atoms bonded together are diatomic molecules like hydrogen (H₂), chlorine (Cl₂), and oxygen (O₂). These molecules are joined by covalent bonds, which are a form of chemical bond where atoms share electrons to attain a stable electron configuration.
Different numbers of atoms can be bonded to form various molecules. For instance, water (H₂O) is formed when two hydrogen atoms and one oxygen atom share electrons via covalent bonds. When the bonded atoms are of different elements, the resulting structure is called a chemical compound, such as methane (CH₄), whereas molecules like molecular hydrogen are not compounds but simple molecules of a single element.