https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:the-periodic-table/x8bc8fb44369617ed:noble-gases/v/introduction-to-group-18-elementsnoble-gases 2026-04-29T07:20:45.495372596Z Introduction to group 18 elementsNoble gases Introduction to group 18 elementsNoble gases Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Introduction to group 18 elementsNoble gases Introduction to group 18 elementsNoble gases https://cdn.kastatic.org/ka-youtube-converted/UmNqnOsSggQ.mp4/UmNqnOsSggQ.mp4 479 Noble gases https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:the-periodic-table/x8bc8fb44369617ed:noble-gases/e/general-trends-in-the-properties-of-group-18-elements 2026-04-29T07:20:45.495372596Z Physical and chemical properties of group-18 elements Let's test our understanding of the various atomic, physical and chemical properties of group-18 elements by answering these questions. Revathi exercise