Besides sulphur and chlorine, which other non-metallic element is present in the third period?

  • Oxygen
  • Fluorine
  • Nitrogen
  • Phosphorus

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The correct option is D Phosphorus.

Phosphorus is located in the third period of the periodic table. It has an electronic configuration of $$2, 8, 5$$, meaning its outer shell contains 5 electrons. To achieve a stable octet configuration, phosphorus needs to gain 3 additional electrons. This tendency to gain electrons imparts non-metallic characteristics to phosphorus.

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