Final answer:
A molecule is a group of two or more atoms that are chemically bonded together and behave as a single unit. Molecules can be represented by their molecular formula, which shows the types and numbers of atoms present in a molecule. Visual models are often used to represent molecules.
Step-by-step explanation:
A molecule is a group of two or more atoms that are chemically bonded together and behave as a single unit. Molecules can be represented by their molecular formula, which shows the types and numbers of atoms present in a molecule. For example, the molecular formula of glucose (C6H12O6) indicates that a single molecule of glucose is composed of six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Some elements, such as hydrogen, oxygen, and sulfur, exist as molecules. Molecules can be represented visually using a model in which atoms are represented by spheres connected by lines that represent chemical bonds.
Overall, molecules are essential in understanding the composition and behavior of matter, and their representation through molecular formulas and models helps us visualize and study their structure and properties.