Define resonance structures with an example
Answers
Explanation:
A molecule or ion with such delocalized electrons is represented by several contributing structures (also called resonance structures or canonical forms). Such is the case for ozone (O3), an allotrope of oxygen with a V-shaped structure and an O–O–O angle of 117.5°.
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DEFINE RESONANCE - DEFINITION
When a molecule is represented by two or more hybrid tructures and that structure are different in the position of electrons not in position of atoms, then the structure is called as resonating structure and this phenomenon is called as resonance.
RULES OF WRITING RESONATING STRUCTURE. - DEFINITION
1.Leave atoms at there positions, draw hydrogen and lone pair of electron to start resonance.
2.Electrons in pi-bonding or non-bonding electron easily participate in resonance.
3.The total number of electrons does not change.
4.Do not exceed the octet rule.
Resonance Structures of NO2– Ion
In the nitrite ion, the bond lengths of both nitrogen-oxygen bonds are equal. The Lewis dot structures of NO2– highlight a difference in the bond order of the two N-O bonds. The resonance hybrid of this polyatomic ion, obtained from its different resonance structures, can be used to explain the equal bond lengths, as illustrated below.
Resonance Structures of NO2
Resonance Structures of NO2- Ion
The resonance hybrid of NO2– suggests that each oxygen atom holds a partial charge of magnitude -½. The bond length of the N-O bonds is found to be 125 pm.
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