Chemical Bonding and Molecular Structure

Bond Parameters

Bond Length:

In a covalently bonded molecule, distance between the nuclei of the two atoms is known as bond length. Bond length increases with increase in the size of bonded atoms and decreases with an increase in the number of bonds between bonded atoms.
Bond length is determined by X-ray diffraction or electron diffraction methods.

Bond Angle:

In a covalently bonded molecule having more than two atoms, the bonds form an angle with each other, which is known as bond angle.
It is determined by X-ray diffraction method.

Bond Order:

It is defined as the number of covalent bonds present in a molecule.

\tt BO = \frac{1}{2}\left[N_{b}-N_{a}\right].

If bond order comes out to be zero, the molecule does not exist.

Bond Enthalpy:

It is the amount of energy released when one mole of covalent bonds is formed while the bond dissociation enthalpy is the amount of energy required to break the one mole of bonds of the same kind so as to separate the bonded atoms in the gaseous state.

View the Topic in this Video from 0:11 to 14:41

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1.\tt Bond \ length\propto \frac{1}{Bond \ Energy}

2. \tt BO = \frac{1}{2}\left[N_{b}-N_{a}\right].