How do we know that which elements are metal and non metal in electronic configuration?

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Solution

Metals have 1-3 electrons in the outer shell of each metal atom and lose electrons readily

Non metals

usually have 4-8 electrons in their outer shell

readily gain or share valence electrons

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How do we know that which elements are metal and non metal in electronic configuration?

Metals have 1-3 electrons in the outer shell of each metal atom and lose electrons readily Non metals usually have 4-8 electrons in their outer shell readily gain or share valence electrons

Metals have 1-3 electrons in the outer shell of each metal atom and lose electrons readily

Non metals

usually have 4-8 electrons in their outer shell

readily gain or share valence electrons