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Atoms are the smallest units of matter that still retain the fundamental chemical properties of an element. Much of the study of chemistry, however, involves looking at what happens when atoms combine with other atoms to form compounds. A compound is a distinct group of atoms held together by chemical bonds.
Atoms and Electron
Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain electrons (negatively charged).
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Atomic nucleus, electrons, and orbitals
The topic of this first chapter is the single atoms. All matter is composed of atoms and to get a general
understanding of the composition of atoms we first have to leam about electromagnetic radiation.
Electromagnetic radiation is closely related to the nature of atoms and especially to the positions and
movements of the electrons relative to the atomic nuclei.

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