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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.
The atom is the smallest subdivision of an element which still retains the properties of that element. In fact, a very good definition of an atom is: the smallest part of an element that can enter into a chemical combination There are around 118 elements known to man, of which 20-30 are really, really important.ydrogen has a set of properties, as does oxygen. However, the set of properties that water has in no way like the two elements. For example, at room temperature (about 20-25 Â°C) water is a liquid while hydrogen and oxygen are gases. Compounds have names and formulas.