Though they are too small to see without a special microscope, atoms make up all of the substances around you. Like all matter, atoms have mass and volume. But atoms are extremely small. A water droplet, like the one hanging from the tip of the leaf in this picture, contains more than a billion trillion atoms! Which of the following is a true statement? A. Atoms do not have mass. B. Atoms can be seen with the naked eye. C. All atoms are the same. D. Atoms make up every substance around you.