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JAMB Chemistry 1995 Question 13

Question 13

Atomic Structure

Which of the following statements is FALSE about isotopes of the same element? They have the

  1. A.same number of electrons in their outermost shells
  2. B.different atomic masses
  3. C.same atomic number and the same number of electrons
  4. D.same atomic number but different number of electrons
Show the answer and explanation

Answer: D (same atomic number but different number of electrons)

Explanation

Isotopes differ only in the number of neutrons. Neutral isotopes of an element have the same number of protons and therefore the same number of electrons, so D is false.