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All atoms consist of a cloud made of electrons that continuously move around the nucleus of the atom that consists of some constituent’s charged particles, protons, and neutrons. The charged particles consist of different values of mass and electric charge value.

From the above-given example of figure (13.3), the approximate radius of the electron cloud of a typical atom (iron) is equal to $1×{10}^{−10}\text{ m}$ . It consists of 26 protons and 30 neutrons, and these protons and neutrons are surrounded by 26 electrons that move around the protons and neutrons.

Hence, the approximate radius of the electron cloud of a typical atom (iron) is equal to $1×{10}^{−10}\text{ m}$.

The main constituents of an ordinary matter are protons, neutrons, and electrons. Protons and neutrons generally exist in the central portion of the matter. A positron is a positive electron that is not a constituent of an ordinary matter. An antiproton is considered an antiparticle of a proton that is also not a constituent of an ordinary atom.

A muon refers to an elementary particle consisting of a negative Coulomb charge but is not a constituent of a particular ordinary matter.

Hence, the protons, neutrons, and electrons are the constituents of ordinary matter.