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JAMB Chemistry 1992 Question 2

Question 2

Metals and their Compounds

There is a large temperature interval between the melting point and the boiling point of a metal because

  1. A.metals have very high melting points
  2. B.metals conduct heat very rapidly
  3. C.melting does not break the metallic bond but boiling does
  4. D.the crystal lattice of metals is easily broken.
Show the answer and explanation

Answer: C (melting does not break the metallic bond but boiling does)

Explanation

When a metal melts, the atoms can slide past each other but the sea of electrons still holds them together. Boiling must separate the atoms completely, which needs far more energy, so the boiling point is much higher.