https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-periodic-table/v/the-periodic-table-new 2026-06-30T16:30:41.535282189Z The periodic table The periodic table organizes elements by atomic number, revealing patterns in their physical and chemical properties. Elements are categorized as metals, nonmetals, or metalloids based on distinct behaviors. Vertical groups share similar chemical properties based on their number of valence electrons. The octet rule explains how atoms achieve stability by gaining, losing, or sharing electrons. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw The periodic table The periodic table organizes elements by atomic number, revealing patterns in their physical and chemical properties. Elements are categorized as metals, nonmetals, or metalloids based on distinct behaviors. Vertical groups share similar chemical properties based on their number of valence electrons. The octet rule explains how atoms achieve stability by gaining, losing, or sharing electrons. https://cdn.kastatic.org/ka-youtube-converted/CtTmUlp3bBo.mp4/CtTmUlp3bBo.mp4 732 The periodic table https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-periodic-table/a/determine-valence-electrons-using-the-periodic-table 2026-04-26T16:30:39.382257956Z Learn: Determine valence electrons using the periodic table Learn how to determine the number of valence electrons for an element using the periodic table. article https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-periodic-table/e/understand-structure-of-the-periodic-table 2026-06-25T12:40:44.68874125Z Understand: Structure of the periodic table Check your understanding of the structure of the periodic table in this set of free, standards-aligned practice questions. Donna fig exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-periodic-table/e/apply-number-of-valence-electrons 2026-06-25T10:00:38.725739878Z Apply: Number of valence electrons Apply your understanding of valence electrons for main group elements in this set of free, standards-aligned practice questions. Emily Cizmas exercise