(D) standard atom is composed of three fundamental sub-atomic particles: $Protons$,$Neutrons$,and $Electrons$. While a $Positron$ (the anti-particle o

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(D) standard atom is composed of three fundamental sub-atomic particles: $Protons$,$Neutrons$,and $Electrons$. While a $Positron$ (the anti-particle of an electron) can be produced during certain types of radioactive decay (such as $\beta^+$-decay),it is not a permanent or fundamental constituent of a stable atom.