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 Energy levels