Final answer:
The correct answer is that atoms are 'chemically' combined to form 'molecules.' Atoms connect through chemical bonds to create molecules, which can be either elements or compounds depending on the types of atoms involved. the correct answer to the question is (a) chemical; molecules.
Step-by-step explanation:
The atoms are chemically combined in some way. Oftentimes, but not always, they come together to form groups of atoms called molecules. Atoms link by forming a chemical bond, which is an electrical attraction that holds atoms near. This bond results in a molecule that is typically more stable than its separate constituent atoms.
When a molecule consists of atoms from two or more different elements, it is known as a chemical compound. For instance, water (H2O) is a compound composed of hydrogen and oxygen atoms. Therefore, the correct answer to the question is (a) chemical; molecules.