Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

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If an atom consists of 9 protons and 10 neutrons, what is its number of electrons?

  1. 8

  2. 9

  3. 10

  4. 11

The correct answer is: 9

To determine the number of electrons in an atom, it is essential to know the balance between protons and electrons, as atoms are typically neutral in charge. The positive charge of protons is countered by the negative charge of electrons, resulting in a neutral atom when these charges are equal. In this case, the atom has 9 protons. Since each proton carries a positive charge, the atom must also have 9 electrons to balance this charge and remain neutral. The presence of 10 neutrons does not affect the electrical charge, as neutrons are neutral particles. Therefore, with 9 protons ensuring a positive charge, the corresponding number of electrons must be equal, which is 9, to maintain the neutral charge of the atom. This understanding clarifies why the answer is indeed that the atom has 9 electrons.

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