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Quick Answer. The three parts of an atom are the protons, neutrons and electrons. Atoms make up the basic building blocks of matter and define the structure of elements. These parts were not officially identified until 1932.
An atom is a compound state of a nucleus and one or more electrons. This system has a certain amount of energy; one kind of energy is that of the electrons which revolve around the nucleus. There exists a state, called ground states, in which this energy is the smallest. Also there exist some other states where the electrons revolve faster or farther from the nucleus; in these states, the energy of the electrons (and the atom on the whole) is higher. These are called excited states (of the atom). â AstoundingJB Mar 13 '14 at 14:43 @AstoundingJB The further the electron is from the nucleus, the slower the speed.