https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electromagnetic-radiation/x6679aa2c65c01e53:wave-behaviors-of-em-radiation/v/electromagnetic_waves 2024-05-16T01:13:56.718395588Z Electromagnetic waves Electromagnetic (EM) waves are produced whenever electrons or other charged particles accelerate. The wavelength of an EM wave is the distance between consecutive points on the wave with the same phase (e.g. one crest to the next crest). The frequency of an EM wave is how many wave cycles are emitted, or pass a given point, per second. The speed of a wave is equal to its frequency times its wavelength. In vacuum, all EM waves travel at speed c = 3 x 10^8 m/s. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/fa27a4a6-9f11-4533-8d14-5569e37dfdff_1280_720_base.png Electromagnetic waves Electromagnetic (EM) waves are produced whenever electrons or other charged particles accelerate. The wavelength of an EM wave is the distance between consecutive points on the wave with the same phase (e.g. one crest to the next crest). The frequency of an EM wave is how many wave cycles are emitted, or pass a given point, per second. The speed of a wave is equal to its frequency times its wavelength. In vacuum, all EM waves travel at speed c = 3 x 10^8 m/s. https://cdn.kastatic.org/ka-youtube-converted/Je_f4RimfKI.mp4/Je_f4RimfKI.mp4 853 Structure of Atom https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:structure-of-atom/x1ac9c643dc8dffee:models-of-an-atom/v/rutherfords-gold-foil-experiment-in 2025-05-24T09:35:11.484794851Z Rutherford's gold foil experiment Let's understand Rutherford's gold foil experiment! Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Rutherford's gold foil experiment Let's understand Rutherford's gold foil experiment! https://cdn.kastatic.org/ka-youtube-converted/Vh4ZSX_chpY.mp4/Vh4ZSX_chpY.mp4 684 Structure of Atom https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:structure-of-the-atom/x46dd29ce84a663ea:models-of-an-atom/v/bohr-s-model-of-an-atom 2023-06-26T12:36:08.867767149Z Bohr's model of an atom How did Bohr respond to the drawbacks in the Rutherford model? Let's find out! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Bohr's model of an atom How did Bohr respond to the drawbacks in the Rutherford model? Let's find out! https://cdn.kastatic.org/ka-youtube-converted/haFTkhOcQaY.mp4/haFTkhOcQaY.mp4 130 Structure of Atom 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 Structure of Atom 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 Structure of Atom https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:the-quantum-model/v/orbitals 2020-09-23T19:58:37Z Shells, subshells, and orbitals The electrons in an atom are arranged in shells that surround the nucleus, with each successive shell being farther from the nucleus. Electron shells consist of one or more subshells, and subshells consist of one or more atomic orbitals. Electrons in the same subshell have the same energy, while electrons in different shells or subshells have different energies. Sal Khan video https://cdn.kastatic.org/googleusercontent/l1scWG8pLvaiTU-leH4UZrqPtmfcaRMt9LJcg7VC3TPuoLK6b3yfeNk37h9Lzj4cjMSkWIrIxwRMnrxwDuHogTUb Shells, subshells, and orbitals The electrons in an atom are arranged in shells that surround the nucleus, with each successive shell being farther from the nucleus. Electron shells consist of one or more subshells, and subshells consist of one or more atomic orbitals. Electrons in the same subshell have the same energy, while electrons in different shells or subshells have different energies. https://cdn.kastatic.org/ka-youtube-converted/26PF9Ctch9Y.mp4/26PF9Ctch9Y.mp4 581 Structure of Atom 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 Structure of Atom https://www.khanacademy.org/science/tg-board-preparation-class-10/xa97495786f3cc874:week-1/xa97495786f3cc874:structure-of-atom/e/structure-of-atomtg 2026-01-19T12:10:35.018251267Z Structure of Atom exam preparation Lets answer some questions Shankar R exercise