https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:structure-of-the-atom/x46dd29ce84a663ea:how-are-electrons-distributed-in-various-shells/v/electron-distribution-in-shells 2023-06-26T12:36:08.867767149Z Electron distribution in shells How are electrons distributed in the shells around the nucleus? Do they follows any rules? Let's find out! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Electron distribution in shells How are electrons distributed in the shells around the nucleus? Do they follows any rules? Let's find out! https://cdn.kastatic.org/ka-youtube-converted/H4bvY_CkSf0.mp4/H4bvY_CkSf0.mp4 605 Electron Distribution and Valency https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:basic-concepts-of-chemistry/x426c9d2c554669cb:structure-of-an-atom/e/electron-distribution-in-electron-orbits 2025-04-09T10:12:02.040424533Z Electron distribution in electron orbits Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:composition-of-matter/x0f256b8de9c7cf34:molecular-formula-and-valency/v/valency-1-in 2025-09-22T21:00:45.252280137Z Valency - 1 What is valency and how do valence electrons help atoms bond? Learn with real examples like O, F, Na, Mg, Cl, C, and Si, and understand how the octet rule guides bonding in this middle school chemistry video! Joel Prakash Stephen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Valency - 1 What is valency and how do valence electrons help atoms bond? Learn with real examples like O, F, Na, Mg, Cl, C, and Si, and understand how the octet rule guides bonding in this middle school chemistry video! https://cdn.kastatic.org/ka-youtube-converted/ysWkiAgri3w.mp4/ysWkiAgri3w.mp4 400 Electron Distribution and Valency https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:composition-of-matter/x0f256b8de9c7cf34:molecular-formula-and-valency/v/valency-2 2025-07-31T18:24:19.362506289Z Valency - 2 What is valency and how does it help predict the number of bonds an atom can form? Learn through real examples like HCl, MgCl₂, H₂O, CH₄, and CO₂ in this fun and clear middle school chemistry video! Joel Prakash Stephen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Valency - 2 What is valency and how does it help predict the number of bonds an atom can form? Learn through real examples like HCl, MgCl₂, H₂O, CH₄, and CO₂ in this fun and clear middle school chemistry video! https://cdn.kastatic.org/ka-youtube-converted/i5bEGnF9w8A.mp4/i5bEGnF9w8A.mp4 387 Electron Distribution and Valency https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atoms-isotopes-and-ions/x2613d8165d88df5e:isotopes-and-ions/v/hs_isotopes 2025-12-03T14:30:51.007256483Z Isotopes Isotopes are atoms of the same element with different numbers of neutrons. Since isotopes of an element have different numbers of neutrons, they also have different masses. The sum of the number of neutrons and protons in an atom is called its mass number. Isotopes can be represented in writing using isotope notation. Wieteke Holthuijzen video https://cdn.kastatic.org/ka_thumbnails_cache/df82de5e-1e56-4266-8fc4-45e02720aca1_1280_720_base.png Isotopes Isotopes are atoms of the same element with different numbers of neutrons. Since isotopes of an element have different numbers of neutrons, they also have different masses. The sum of the number of neutrons and protons in an atom is called its mass number. Isotopes can be represented in writing using isotope notation. https://cdn.kastatic.org/ka-youtube-converted/HDniYwGEl0o.mp4/HDniYwGEl0o.mp4 250 Electron Distribution and Valency https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:inside-the-atom/x0f256b8de9c7cf34:atomic-number-and-mass-number/e/isotopes-and-formation-of-ions 2026-04-07T23:55:07.30621384Z Isotopes, formation of ions and valency Let's solve some questions Vibhor exercise https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:structure-of-the-atom/x46dd29ce84a663ea:how-are-electrons-distributed-in-various-shells/e/find-the-valency-of-an-atom 2021-04-29T08:03:16Z Find the valency of an element Let's practice to find the valency of a neutral atom given its atomic number. Chaitra exercise https://www.khanacademy.org/science/odia-class-10-physical-sciences/x28e877d8a7566183:periodic-classification-of-elements/x28e877d8a7566183:periodic-trends-in-valency-atomic-size/e/valency--write-the-formula-of-a-compound 2026-02-27T12:30:36.531197313Z Valency: Write the formula of a compound Let's write the formula of a compound by knowing the valency of elements combining with each other. Valency can be found by knowing the valence electrons. Valence electrons can be found by writing the electronic configuration. Chaitra exercise https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-periodic-table/e/apply-number-of-valence-electrons 2026-04-26T16:30:39.382257956Z Apply: Number of valence electrons Apply your knowledge of valence electrons for main group elements in this set of free practice questions. Emily Cizmas exercise https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:structure-of-the-atom/x46dd29ce84a663ea:how-are-electrons-distributed-in-various-shells/e/electron-distribution-in-an-atom-and-calculation-of-valency 2026-05-05T11:40:38.055549321Z Electron distribution in an atom/ion and calculation of valency. Let's solve a few problems to calculate valency and see how electrons are distrubuted in an atom. Aanchal Arora exercise