Question:

Which of the following has the highest bond energy ?

Updated On: Jul 7, 2022
  • Fluorine
  • Bromine
  • Iodine
  • Chlorine
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The Correct Option is D

Solution and Explanation

Bond energy of Fluorine (although $F_2$ has smallest bond length) is lesser than $Cl_2$ and $Br_2$ due to greater interelectronic repulsions between the lone pair of electrons on F atom. Halogen F - F Cl - Cl Br - Br I - I Bond dissociation 38 57 45.5 35.5 energy (kcal/mol) So chlorine has highest bond energy.
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Notes on p -Block Elements

Concepts Used:

P-Block Elements

  • P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
  • P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.

P block elements consist of: