Hydronium ion are positively charged molecule
Here as per given data hydronium ion are positively charged molecule consists of three hydrogen atoms bonded to an oxygen atom, this molecule is written as H3O⁺ that's why it is called hydronium ion. this means that in the bond between hydrogen and oxygen and oxygen pull harder on the shared electrons thus causing a partial negative charge on the molecule and causing it to be attracted to the positive charge of H⁺ to form hydronium.
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