Chemistry is the branch of science that examines the characteristics, make-up, and structure of substances (specified as elements and compounds), as well as the changes they go through and the energy released or absorbed. Every substance, whether created through natural processes or through manmade means, is made up of one or more of the roughly a hundred types of atoms that have been classified as elements. There is no amount of oxygen, mercury, or gold that is smaller than an atom of that substance, for example. These atoms, in turn, are made up of more elementary particles, but they are still the fundamental building blocks of chemical substances. As a result, chemistry focuses on the properties of atoms, the laws that govern their combinations, and how this knowledge may be used to create new materials.
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