https://www.khanacademy.org/science/ap-biology/chemistry-of-life/introduction-to-biological-macromolecules/v/covalent-bonds 2023-12-18T19:15:22.874322042Z Covalent bonds Covalent bonds involve shared electron pairs between atoms. Each atom contributes one electron to each shared pair, and effectively gains an additional electron from the shared pair. Atoms share the same number of pairs needed to fill their valence shell, usually with eight. Hydrogen only needs one additional electron to fill its valence shell, so it shares only one pair. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/c5b45032-3e0e-4dc5-bfbe-fbeb4412d879_1280_720_base.png Covalent bonds Covalent bonds involve shared electron pairs between atoms. Each atom contributes one electron to each shared pair, and effectively gains an additional electron from the shared pair. Atoms share the same number of pairs needed to fill their valence shell, usually with eight. Hydrogen only needs one additional electron to fill its valence shell, so it shares only one pair. https://cdn.kastatic.org/ka-youtube-converted/kS5iU4v0QZk.mp4/kS5iU4v0QZk.mp4 343 Covalent bonding https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:covalent-bonds/e/understand-covalent-bonds 2026-04-26T16:30:39.382257956Z Understand: Covalent bonds Check your understanding of covalent bonds in this set of free practice questions. Emily Cizmas exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:covalent-bonds/e/apply-predicting-covalent-bonds 2026-04-26T16:30:39.382257956Z Apply: Predicting covalent bonds Apply your knowledge of covalent bonds in this set of free practice questions. Emily Cizmas exercise https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:chemical-bonding/x426c9d2c554669cb:basics-of-covalent-bonding/v/covalent-bond-molecules-with-same-atoms 2023-07-28T12:36:06.632326991Z Covalent bond: Molecules with same atoms Let's explore how similar atoms form covalent bonds with each other Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Covalent bond: Molecules with same atoms Let's explore how similar atoms form covalent bonds with each other https://cdn.kastatic.org/ka-youtube-converted/of6ZSQzz3BY.mp4/of6ZSQzz3BY.mp4 289 Covalent bonding https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:chemical-bonding/x426c9d2c554669cb:basics-of-covalent-bonding/e/covalent-bonding-molecules-with-same-atoms 2026-05-12T22:10:47.015864082Z Covalent bonding: Molecules with same atoms Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:chemical-bonding/x426c9d2c554669cb:basics-of-covalent-bonding/v/covalent-bond-molecules-with-different-atoms 2023-07-28T12:36:06.632326991Z Covalent bond: Molecules with different atoms Let's explore how molecules with different atoms (heteroatomic) form covalent bonds. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Covalent bond: Molecules with different atoms Let's explore how molecules with different atoms (heteroatomic) form covalent bonds. https://cdn.kastatic.org/ka-youtube-converted/o_gGFU2t9As.mp4/o_gGFU2t9As.mp4 346 Covalent bonding https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:chemical-bonding/x426c9d2c554669cb:basics-of-covalent-bonding/e/covalent-bonding-molecules-with-different-atoms 2026-05-12T22:10:47.015864082Z Covalent bonding: Molecules with different atoms Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/cambridge-o-level-chemistry-cie/x8bc8fb44369617ed:atoms-elements-and-compounds/x8bc8fb44369617ed:simple-molecules-and-covalent-bonds/a/single-and-multiple-covalent-bonds 2021-04-29T08:03:56Z Single and multiple covalent bonds article