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As we know, an atom is the smallest building block of everything that exists. It is composed of three sub-atomic particles: the proton, neutron, and electron. Protons and neutrons make up the nucleus of the atom, a dense and positively charged core, while the negatively charged electrons can be found around the nucleus in an electron cloud.
Atoms can be different by having different numbers of protons, neutrons and electrons. Atoms are the units of chemical change.
