https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atoms-isotopes-and-ions/x2613d8165d88df5e:atomic-structure/v/protons-neutrons-and-electrons-in-atoms 2025-11-01T06:31:04.963641538Z Protons, neutrons, and electrons in atoms Atoms are made up of three types of subatomic particles: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus, the dense region at the center of an atom. Electrons are found outside the nucleus. Protons are positively charged and have a mass of about 1 u. Neutrons are neutral (have no charge) and also have a mass of about 1 u. Electrons are negatively charged and have a much smaller mass of about 0.0005 u. Wieteke Holthuijzen video https://cdn.kastatic.org/ka_thumbnails_cache/b0e49086-7776-4d8b-8b13-7afbfd62b856_1280_720_base.png Protons, neutrons, and electrons in atoms Atoms are made up of three types of subatomic particles: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus, the dense region at the center of an atom. Electrons are found outside the nucleus. Protons are positively charged and have a mass of about 1 u. Neutrons are neutral (have no charge) and also have a mass of about 1 u. Electrons are negatively charged and have a much smaller mass of about 0.0005 u. https://cdn.kastatic.org/ka-youtube-converted/lz_gMkQr7YE.mp4/lz_gMkQr7YE.mp4 151 Structure of an atom https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atoms-isotopes-and-ions/x2613d8165d88df5e:atomic-structure/a/atomic-structure 2026-04-30T07:30:36.209464894Z Learn and try: Atomic structure Learn about the substructure of an atom, including locations, charges, and roles of protons, neutrons, electrons. article https://www.khanacademy.org/science/bridge-course-class-11th-chemistry/x426c9d2c554669cb:basic-concepts-of-chemistry/x426c9d2c554669cb:structure-of-an-atom/e/structure-of-an-atom 2023-08-13T07:34:46.711956309Z Structure of an atom Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electrostatics/x6679aa2c65c01e53:static-electricity/v/static_electricity 2024-07-01T11:54:52.194339821Z Static electricity Most macroscopic objects are electrically neutral most of the time. However, objects can develop a static net charge if they pick up extra electrons or lose some electrons. This can happen through friction. Objects with opposite net charges attract, and objects with like net charges repel. It's also possible for a net neutral object to be attracted to a charged object. This happens because atoms near the surface of the neutral object become polarized. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/a960a780-48f2-4140-8a3c-6c68243ea924_1280_720_base.png Static electricity Most macroscopic objects are electrically neutral most of the time. However, objects can develop a static net charge if they pick up extra electrons or lose some electrons. This can happen through friction. Objects with opposite net charges attract, and objects with like net charges repel. It's also possible for a net neutral object to be attracted to a charged object. This happens because atoms near the surface of the neutral object become polarized. https://cdn.kastatic.org/ka-youtube-converted/D5pJKu_QjRo.mp4/D5pJKu_QjRo.mp4 559 Structure of an atom