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It has 3 valencies i.e., 3,2,1.coz its structure is O-O=O
The central atom makes 3 bonds so it has valency-3
The atom which makes double bond with central atom has 2 valencies coz its connected by 2 bonds.
While 1st atom has 1 valency coz its connected by 1 bond
0 0 0
Valancy is no of electrons needed to become octect.ozone is 03 so valency may be 5
1 1 1
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