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The atomic number of an atom is always equal to the number of its (1) protons, only(2) neutrons, only(3) protons plus neutrons(4) protons plus electrons
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The atomic number of an atom is always equal to the number of its

(1) protons, only(2) neutrons, only(3) protons plus neutrons(4) protons plus electrons

User Bobby B
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The answer is (1) protons only. The proton and neutron consist of nucleus but the proton number is equal to atomic number. The atomic mass is equal to protons plus neutrons.
User Lyubomir
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