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@Dexter
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.As we move down the group, size increases
And, as move left to right across a period, size decreases
The order of atomic radius here is Na > Mg > Al > Li > Be > B
So, Boron has least radius in here and it has valency 3
Hence, it forms B2O3
Thanks got confused with the size of oxide
+solved @Prachi
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