GC Periodic Classification

Which one of the following alkali metals has lowest melting point?

  1. Sodium
  2. Potassium
  3. Rubidium
  4. Caesium

Answer

 Caesium (Cs) has the lowest melting point. As the size of the metal decreases, the strength of metallic bond decreases and hence its melting point decreases,

The correct option is D.