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JAMB Chemistry 1979 Question 13

Question 13

Atomic Structure

Helium atoms are chemically unreactive because

  1. A.there are no electrons around the nucleus
  2. B.the number of protons equals the number of electrons
  3. C.there are equal number of protons and neutrons in the nucleus
  4. D.the outer electron shell is completely filled
  5. E.the atoms contain only protons.
Show the answer and explanation

Answer: D (the outer electron shell is completely filled)

Explanation

Helium's only shell holds 2 electrons and is full (a duplet), so the atom has no tendency to gain, lose or share electrons.