https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-quantum-model/v/electron-configurations-with-the-periodic-table 2024-08-16T15:18:47.217883837Z Electron configurations with the periodic table The periodic table is organized by grouping elements with similar chemical properties and electron structures. An element's location on the table can be used to determine its electron configuration. By following the order of periods (rows) and blocks (s, p, d, f), you can trace how electrons fill the atom's orbitals and efficiently determine the distribution of electrons in an atom. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/97662d3a-39a7-4057-b45f-756dcd05369c_1280_720_base.png Electron configurations with the periodic table The periodic table is organized by grouping elements with similar chemical properties and electron structures. An element's location on the table can be used to determine its electron configuration. By following the order of periods (rows) and blocks (s, p, d, f), you can trace how electrons fill the atom's orbitals and efficiently determine the distribution of electrons in an atom. https://cdn.kastatic.org/ka-youtube-converted/hwqLCwgo6SU.mp4/hwqLCwgo6SU.mp4 879 Electronic configuration https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-quantum-model/e/apply-electron-configurations 2026-03-11T21:50:47.587134886Z Apply: electron configurations Apply your understanding of electron configurations in this set of free practice questions. Allen Ruch exercise https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:atomic-structure-and-electron-configuration/v/valence-electrons 2021-06-02T13:23:00Z Valence electrons Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴. Sal Khan video https://cdn.kastatic.org/googleusercontent/1-SDhld53fPWo8Ty3Cjsd0wP0tof-RJHkMCcqUALGsvplA3o9ochIm7uKxGRuTrkujMXgFo4PA9spOJS7m4rRoqk3g Valence electrons Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴. https://cdn.kastatic.org/ka-youtube-converted/cZTdBsAjPPk.mp4/cZTdBsAjPPk.mp4 311 Electronic configuration https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/orbitals-and-electrons/v/quantum-numbers 2022-11-16T04:22:43.7414897Z Quantum numbers An orbital is a region around an atom's nucleus where electrons are likely to be found. Different types of orbitals (s, p, d, f) have different shapes and can hold different numbers of electrons. Learn how quantum numbers are used to describe the orbitals, and compare Bohr model orbits with the quantum mechanical model of atom. Jay video https://cdn.kastatic.org/googleusercontent/_QaEq1U87HVAKgVIwruvdrmoI_aaqRSHFy01cZkC-upvvE3wBb4cvnVv61_WLPwKqCOyjI1OhPnE2NIAjeW3vobv Quantum numbers An orbital is a region around an atom's nucleus where electrons are likely to be found. Different types of orbitals (s, p, d, f) have different shapes and can hold different numbers of electrons. Learn how quantum numbers are used to describe the orbitals, and compare Bohr model orbits with the quantum mechanical model of atom. https://cdn.kastatic.org/ka-youtube-converted/KrXE_SzRoqw.mp4/KrXE_SzRoqw.mp4 720 Electronic configuration https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/orbitals-and-electrons/v/quantum-numbers-for-the-first-four-shells 2021-01-04T18:35:18Z Quantum numbers for the first four shells Calculates number of orbitals and number of electrons in different kinds of orbitals for n = 1 to 4. Explains that only two electrons are allowed per orbital, and gives shortcuts for calculating number of orbitals and total number of electrons for a given n. Jay video https://cdn.kastatic.org/googleusercontent/xBX5TKTil3UEDvbjo9zhR6nY3nKhIvzb9cHbSWyU2js9B-LTmU4DLfxs4BovVvpJpzelIoOrPGzayhIrNDLPrBV- Quantum numbers for the first four shells Calculates number of orbitals and number of electrons in different kinds of orbitals for n = 1 to 4. Explains that only two electrons are allowed per orbital, and gives shortcuts for calculating number of orbitals and total number of electrons for a given n. https://cdn.kastatic.org/ka-youtube-converted/qLU0X154wlE.mp4/qLU0X154wlE.mp4 757 Electronic configuration https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-quantum-model/v/the-aufbau-principle 2022-09-07T08:21:01.673602243Z The Aufbau principle The Aufbau principle states that electrons fill lower-energy atomic orbitals before filling higher-energy ones (Aufbau is German for "building-up"). By following this rule, we can predict the electron configurations for atoms or ions. The Aufbau principle is most useful for the first 20 elements: from Sc on, the Aufbau principle does not accurately predict the order of electron filling in atoms. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/2a1ae6eb-c75a-4051-9e2f-a6ca800d03ac_1280_720_base.png The Aufbau principle The Aufbau principle states that electrons fill lower-energy atomic orbitals before filling higher-energy ones (Aufbau is German for "building-up"). By following this rule, we can predict the electron configurations for atoms or ions. The Aufbau principle is most useful for the first 20 elements: from Sc on, the Aufbau principle does not accurately predict the order of electron filling in atoms. https://cdn.kastatic.org/ka-youtube-converted/Zersl0Ji3P0.mp4/Zersl0Ji3P0.mp4 473 Electronic configuration https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/electron-configurations-jay-sal/v/electron-configurations-for-the-first-period 2021-03-29T04:28:54Z Electron configurations for the first period Introduces aufbau principle, Pauli exclusion principle, and orbital notation. Writes out the quantum numbers for the electrons in H and He. Jay video https://cdn.kastatic.org/googleusercontent/71jHuZ3ZhdBwzQA4YKbnzgnWNqyyIGIq57tZ9vrmy6w19uPgdLy2v98oS5ZUy5_0TtZioYQXbMV_KeNa6lgDoMrg3g Electron configurations for the first period Introduces aufbau principle, Pauli exclusion principle, and orbital notation. Writes out the quantum numbers for the electrons in H and He. https://cdn.kastatic.org/ka-youtube-converted/0MKsFD03Ukc.mp4/0MKsFD03Ukc.mp4 382 Electronic configuration https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/electron-configurations-jay-sal/v/electron-configurations-for-the-second-period 2021-03-29T04:28:54Z Electron configurations for the second period Writes out quantum numbers for all elements of the second period. Introduces Hund's rule, and connects blocks in periodic table with electron configuration. Jay video https://cdn.kastatic.org/googleusercontent/14C7HyvA3BiZRZf8KtCkud1QMLTi4tewiPbWoaj5iDuwIb1ZkQxyezv-Uypl7EXQtJ7PkqAkGuDbXovGXqdXBXkmjw Electron configurations for the second period Writes out quantum numbers for all elements of the second period. Introduces Hund's rule, and connects blocks in periodic table with electron configuration. https://cdn.kastatic.org/ka-youtube-converted/UEPs-GA2s40.mp4/UEPs-GA2s40.mp4 732 Electronic configuration https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-quantum-model/v/introduction-to-electron-configurations 2021-05-26T15:51:55Z Introduction to electron configurations Electron configurations describe where electrons are located around the nucleus of an atom. For example, the electron configuration of lithium, 1s²2s¹, tells us that lithium has two electrons in the 1s subshell and one electron in the 2s subshell. Sal Khan video https://cdn.kastatic.org/googleusercontent/7qvxjh_LjGjrWRL3b-2aGr7nmfGbMjeckykwlEfIvMJz9LPmUOTJSsWxrNI-fc58qAHMD2gEoo0Br36E3idGo3vk Introduction to electron configurations Electron configurations describe where electrons are located around the nucleus of an atom. For example, the electron configuration of lithium, 1s²2s¹, tells us that lithium has two electrons in the 1s subshell and one electron in the 2s subshell. https://cdn.kastatic.org/ka-youtube-converted/LyFzELsUgBU.mp4/LyFzELsUgBU.mp4 308 Electronic configuration https://www.khanacademy.org/science/grade-11-chemistry-snc-aligned/x203b0fc81a964b2d:atomic-structure/x203b0fc81a964b2d:electronic-configuration/e/relating-electronic-configurations-and-position-of-elements 2025-02-05T10:28:14.374739025Z Relating electronic configurations and position of elements In this exercise, we will solve questions on how electronic configuration determines the position of different elements in the periodic table. Revathi exercise