# Why higher energy is required for stretching vibration as compared to the bending vibrantion?

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Mar 8, 2018

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**Stretching vibrations**

In a stretching vibration, the atoms move in and out along the internuclear axis.

The nuclei are moving apart against the attraction of the bonding electrons between them.

**Bending vibrations**

In a bending vibration, the bond *length* does not change.

Instead, the bond *angle* changes.

The angle distorts from the ideal angle for the orbitals (say, 120° or 109.5°).

It is easier to bend a bond than to stretch it because the nuclei are not moving against the attraction of the bonding electrons.

Thus, a stretching vibration has a higher frequency and requires more energy than a bending vibration.

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