The sum of protons and neutrons in the atom has been 82. Thus, option D is correct.
The atom has been the smallest unit of matter. The subatomic particles in the atom have been neutrons, protons, and electrons.
The atomic number has been the representation of the number of electrons in an atom. The atomic number of atom has been 26. Thus, the number of electrons in the atom has been 26.
The number of protons and electrons in an atom are equal. Thus, the number of protons in an atom is 26.
The number of neutrons in the atom are 56.
The sum of protons and neutrons has been atomic mass. It has been given as:
[tex]\rm Atomic\;mass=Neutrons+Protons\\Atomic\;mass=56+26\\Atomic\;mass=82[/tex]
The sum of protons and neutrons in the atom has been 82. Thus, option D is correct.
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