Covalent Bond Dissociation Energy

[Tam To 1B]

What exactly is covalent bond dissociation energy and how does it relate to atomic radius, bond multiplicity, and lone pairs in bonding?

[Kristen Kim 2K]

Dissociation energy is the energy required to break a bond. Bond multiplicity refers to how many bonds are between two atoms, and as the number of bonds increase, the dissociation energy also increases because it takes more energy to break multiple bonds. As atomic radius increases, dissociation energy decreases. A larger atom means a larger distance (longer bond length), which means the bond becomes weaker, and dissociation energy is low because it doesn't take much energy to break the bond. As number of lone pairs increase, dissociation energy decreases because lone pairs on neighboring atoms repel each other, weakening the bond.

[Chem_Mod]

Dissociation energy is the energy required to break a covalent bond. It is affected by the factors you mentioned. See notes and textbooks for details.