Answer:

Molecules are a group of atoms.

Atoms:
Atoms are the basic building blocks of matter. They are the smallest unit of an element that retains its chemical properties. Atoms consist of three subatomic particles: protons, neutrons, and electrons. The nucleus of an atom contains protons and neutrons, while the electrons orbit around the nucleus.

Molecules:
Molecules are formed when two or more atoms chemically combine with each other. They can be composed of the same type of atoms, known as elements, or different types of atoms, forming compounds. Molecules are held together by chemical bonds, which can be covalent, ionic, or metallic in nature.

Elements:
Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means. Each element consists of only one type of atom. For example, oxygen (O₂) is an element composed of two oxygen atoms. The periodic table lists all the known elements, each represented by a unique symbol.

Compound:
A compound is a substance composed of two or more different elements chemically bonded together. Compounds can be represented by chemical formulas, which indicate the types and ratios of atoms present. For instance, water (H₂O) is a compound consisting of two hydrogen atoms bonded to one oxygen atom.

Summary:
In summary, molecules are a group of atoms that are chemically bonded together. Atoms are the basic units of elements, and when they combine, they form molecules. Compounds, on the other hand, are substances composed of two or more different elements. Understanding the relationship between atoms, molecules, elements, and compounds is fundamental in the study of chemistry.

A molecule is an electrically neutralgroup of two or more atoms held together by chemical bonds.Molecules are distinguished from ions by their lack of electrical charge.