Which of the following is FALSE about elements? O A. The elements carbon, hydrogen, oxygen, and nitrogen (CHON) are the most common elements in living things, like your body. O B. The elements that are most common in living things are also the most common in nonliving things on Earth. OC. Elements are pure substances made of just one kind of atom. O D. Elements cannot be broken down into other substances using normal chemical means. O E. The smallest amount of an element that acts like that element in a chemical reaction is an atom.

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.