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Suman Kumar
You said correct Shib oxygen needs 2 eletron so it can form coordinate bond.
But like oxygen there are many which needs 2 eletron
For H+ needs 2 eletron.
CH3 + needs 2 eletron.
Got it Shib
BF3 also needs 2 eletron so it can also form coordinate bond
Got it Shib 🙏