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JAMB Physics 2023 Question 10

Question 10

Radioactivity and Nuclear Physics

The net charge on the atom is zero because

  1. A.the electrons and the protons that are charged are in the nucleus
  2. B.the total charge on the electrons is equal to the total charge on the neutrons
  3. C.the neutrons form a shield around the charged protons.
  4. D.the number of electrons in an atom is equal to the number of protons.
Show the answer and explanation

Answer: D (the number of electrons in an atom is equal to the number of protons.)

Explanation

Each proton carries +e and each electron −e. A neutral atom has equal numbers of them, so the charges cancel.