For every neutral atom, the atomic number is the number of protons, and the number of protons is equal to the number of electrons. Option A.
Atoms contain positively charged components known as protons, negatively charged components known as electrons, and neutral components known as neutrons.
Protons and neutrons are located in the nuclei of atoms while electrons are found outside the nuclei in the orbitals. For every neutral atom, the number of positively charged components (protons) always balances the number of negatively charged components (electrons).
Also, the atomic number of atoms is the number of protons in the nuclei of atoms. Thus, for neutral atoms, the number of protons equals the number of electrons which also equals the atomic number.
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