https://www.khanacademy.org/college-careers-more/bjc/2019-challenge/2019-challenge-regional-champions/v/the-quark-theory-of-hadrons 2020-11-18T19:37:52Z The quark theory of hadrons By Ishaan Vohra. Country: UK. Europe Region Champion: 2019 Breakthrough Junior Challenge video https://cdn.kastatic.org/googleusercontent/3FuSEKVq0s5LOI_gA1Eqz0NfHWHdnymunE7oc0w7ipd8awp2GZ4Kvc-6n-ePg0bUnLE4IDMJyvgwx52VMOo8ppBoeA The quark theory of hadrons By Ishaan Vohra. Country: UK. Europe Region Champion: 2019 Breakthrough Junior Challenge https://cdn.kastatic.org/ka-youtube-converted/fwn-ZPIKY48.mp4/fwn-ZPIKY48.mp4 181 Quarks, hadrons and their role in nuclear decay 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 Quarks, hadrons and their role in nuclear decay https://www.khanacademy.org/science/ap-biology/chemistry-of-life/elements-of-life/v/elements-and-atoms 2023-03-31T23:16:47.953017837Z Elements and atoms Elements are pure substances with specific properties. Atoms are the smallest units of elements that still retain the element's properties. Atoms contain electrons, neutrons, and protons. Each element is defined by the number of protons in its nucleus. Sal Khan video https://cdn.kastatic.org/googleusercontent/zfLHeNHjPfEhSYfKtZLu6Ft_uFg2p_L9gALjUyfahbjdBzZbrDLxrg-rk_mrsUBBVIKs44ALBBI1Gv8cm2O_Ppa05g Elements and atoms Elements are pure substances with specific properties. Atoms are the smallest units of elements that still retain the element's properties. Atoms contain electrons, neutrons, and protons. Each element is defined by the number of protons in its nucleus. https://cdn.kastatic.org/ka-youtube-converted/IFKnq9QM6_A.mp4/IFKnq9QM6_A.mp4 789 Quarks, hadrons and their role in nuclear decay https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/light-fundamental-forces/v/four-fundamental-forces 2021-04-04T12:52:27Z Four fundamental forces Gravity, Weak, Electromagnetic and Strong Sal Khan video https://cdn.kastatic.org/googleusercontent/QYfPEn_0G-fMlVMynWqJfVzR9Ezim_rOy3LBUEZ0PNh6lFscEU3bCXVzsdfs8v5DFBPG_rfdUI-PaDOU-1me3D4s Four fundamental forces Gravity, Weak, Electromagnetic and Strong https://cdn.kastatic.org/ka-youtube-converted/FEF6PxWOvsk.mp4/FEF6PxWOvsk.mp4 629 Quarks, hadrons and their role in nuclear decay https://www.khanacademy.org/science/in-in-class-12th-physics-india/nuclei/in-in-nuclear-physics/v/when-does-each-type-of-decay-occur 2022-11-26T09:45:50.502157333Z When does each type of decay occur? Unstable nuclei can undergo alpha, beta or gamma decay. In this video, we explore when alpha and beta decay occur. Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw When does each type of decay occur? Unstable nuclei can undergo alpha, beta or gamma decay. In this video, we explore when alpha and beta decay occur. https://cdn.kastatic.org/ka-youtube-converted/OkKTmwRpsjQ.mp4/OkKTmwRpsjQ.mp4 733 Quarks, hadrons and their role in nuclear decay