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Question

Why does the boiling point of Group-1 metals decrease?


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Solution

  • The boiling point is the temperature at which a substance starts boiling and changes into a vapor state.
  • Considering the metals of Group-1, as we move down the group, the atomic size increases as with every metal in the group, a new energy level is added up.
  • The electrons present in the outermost shells are far from the nucleus. They are no longer under the influence of the nucleus.
  • This weakens the force of attraction between the atoms of the metal.
  • So, less energy is required for boiling to happen. The boiling will occur at a lower temperature.
  • Hence, the boiling point of Group-1 elements decreases down the group.

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