Answer:
The oxalate ion have four resonance structures
Explanation:
The Lewis structure is a graphical representation of molecules that shows the electrons and bonds that exist in a particular compound. This representation has been very useful in fields of chemistry as organic and synthetyc chemistry.
One appliance for this Lewis structures is the explanation of unreactivity of some compounds with resonance structures. The more resonance structures, the less reactivity.
In the picture you can see the initial Lewis representation of oxalate ion and their different resonance structures. The general idea is to move electrons from more negative atoms to the less ones but there is no specific rules. To develop the resonance structures it is necessary to practice and practice. Remember: Practice makes perfect.
