Answer:
If you want smaller def's let me know.
Step-by-step explanation:
Element: "The term "element" is used for atoms with a given number of protons (regardless of whether or not they are ionized or chemically bonded, e.g. hydrogen in water) as well as for a pure chemical substance consisting of a single element (e.g. hydrogen gas)."
Atom: "An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid , liquid , gas , and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers ( 1 × 10 −10 m , a ten-millionth of a millimeter, or 1/254,000,000 of an inch)."
Molecule: A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. However, in quantum physics, organic chemistry, and biochemistry, the term molecule is often used less strictly, also being applied to polyatomic ions.