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On what basis an element can be classifi...

On what basis an element can be classified as a metal or a non-metal?

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The metallic character of an element is due to its tendency to release electrons. By losing electrons, metal atoms change to positive ions or cations. Hence, metals are electropositive in nature. `M-e^(-) rarr M^(+)`
Non-metallic character of an element is due to its electron accepting tendency. By accepting electrons, non-metal atoms change to negative ions. Hence, non-metals are electronegative in nature. `E+ e^(-) rarr E^(-)`
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