Question

Explain details regarding Bond energies in Halogen group.​

Answer 1

Answer:

Bond formation energy:- Energy released when any bond is formed is known as bond formation energy or bond energy. ... Because of higher electron density and small size of fluorine atoms, repulsion between electrons of two F- atoms weakens the bond energy.

Answer 2

Answer:

• With the increase of size, the bond length increases from fluorine to iodine.
• Since the bond length of fluorine is minimum, its bond dissociation energy should be highest. However, the bond dissociation energy of fluorine is less than Cl –Cl and Br– Br.
• The lower value of bond dissociation energy of fluorine is due to the high inter–electronic repulsions between non–bonding electrons in the 2p - orbitals of fluorine.
• As a result, F – F bond is weaker in comparison to Cl – Cl and Br – Br bonds.
• Thus, the bond dissociation energy follows the sequence:

Cl2 > Br2 > F2 > I2