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An element forms an oxide A(2)O(3) which...

 An element forms an oxide `A_(2)O_(3)` which is acidic in nature. Identify A as a metal or non-metal.

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Oxides of non-metals are acidic in nature while those of metals are basic. As the element A forms an acidic oxide. therefore. A must be a non-metal. Also it should have + 3 charge. i.e., it should have 3 valence electrons. Therefore. A is boron,(electronic configuration is 2. 3) and its oxide is `B_(2)O_(3)`.
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NCERT EXEMPLAR-METALS AND NON- METALS-Metals And Non- Metals
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