Why is a division of the elements into two groups, acid-formers and bare-formers, somewhat unsatisfactory?
The oxides and hydroxides of the metals of Group 3 and higher tend to be only weakly basic, and most& display an amphoteric nature. So, we cannot fit this metals in any of this group. Also, most of these compounds are so slightly soluble in water that their acidic& or basic character is only obvious in their reactions with strong acids or bases.
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