https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:periodic-trends/v/atomic-radii-trends 2023-12-15T18:39:28.793791463Z Atomic radii trends Atoms are not all the same size. The relative size of the atoms follows a set of trends on the periodic table. Going across a period, the main group elements tend to decrease in atomic radius due to the increased nuclear charge. Going down a group, the main group elements tend to increase in atomic radius due to increased shielding and the addition of new shells to the structure of the atom. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/b20fde22-88b0-4dfa-8d69-9a73f51373fa_1280_720_base.png Atomic radii trends Atoms are not all the same size. The relative size of the atoms follows a set of trends on the periodic table. Going across a period, the main group elements tend to decrease in atomic radius due to the increased nuclear charge. Going down a group, the main group elements tend to increase in atomic radius due to increased shielding and the addition of new shells to the structure of the atom. https://cdn.kastatic.org/ka-youtube-converted/RrwL99bEotk.mp4/RrwL99bEotk.mp4 288 Periodic trends - atomic radius https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/periodic-table-trends-bonding/v/atomic-radius-trend 2021-01-04T18:35:18Z Atomic radius trends on periodic table How atomic radius is defined, and trends across a period and down a group. Sal Khan video https://cdn.kastatic.org/googleusercontent/wPur6xJb3jGMXgdi0bjIrXHKq9cxiKIFqPFNjDNTSUROzeO4CCnLmpfJZV8UdcOJHHdpexBf_zUmw826lyj_ub5T1g Atomic radius trends on periodic table How atomic radius is defined, and trends across a period and down a group. https://cdn.kastatic.org/ka-youtube-converted/q--2WP8wXtk.mp4/q--2WP8wXtk.mp4 580 Periodic trends - atomic radius https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atomic-models-and-periodicity/x2613d8165d88df5e:periodic-trends/e/apply-atomic-radii-trends 2026-03-11T05:00:37.141016324Z Apply: atomic radii trends Apply your understanding of atomic radii trends in this set of free practice questions. Eric exercise