There are three elements E, F, G with atomic numbers 19, 8, and 17 respectively. Classify the above elements as metals and non-metals.

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Solution

$∙$ The element of E (19) having electronic configuration 2, 8, 8, 1 has 1 valence electron so it must be a metal.
$∙$ The element of F (8) having electronic configuration 2, 6 has 6 valence electrons so it must be a non-metal.
$∙$ Similarly, the element of G (18) having electronic configuration 2, 8, 7 has 7 valence electrons, must be a halogen which is a non-metal

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