Metal oxides which show both basic and acidic nature
Answers
The trend in acid-base behaviour is shown in various reactions, but as a simple summary:
The trend is from strongly basic oxides on the left-hand side to strongly acidic ones on the right, via an amphoteric oxide (aluminium oxide) in the middle. An amphoteric oxide is one which shows both acidic and basic properties.
For this simple trend, you have to be looking only at the highest oxides of the individual elements. Those are the ones on the top row above, and are where the element is in its highest possible oxidation state. The pattern isn't so simple if you include the other oxides as well.
For the non-metal oxides, their acidity is usually thought of in terms of the acidic solutions formed when they react with water - for example, sulphur trioxide reacting to give sulphuric acid. They will, however, all react with bases such as sodium hydroxide to form salts such as sodium sulphate.
Metal oxides which shows both basic and acidic in nature are called amphoteric oxides.
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