Question

how to know by electronic configaration that an element is non metal​

Answer 1

Answer:

Non-metals have 5, 6 or 7 electrons in their valence shell whereas metals have 1, 2 or 3 electrons.

Answer 2

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Non-metals have 5, 6 or 7 electrons in their valence shell whereas metals have 1, 2 or 3 electrons.