DefinePK

Description

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:atoms-elements-and-the-periodic-table/x2613d8165d88df5e:periodic-trends/v/atomic-radii-trends

Want to explore more? Check out the full Atomic models and periodicity playlist here: https://youtube.com/playlist?list=PLSQl0a2vh4HBLR7jdrTrb81DNX6MaICRO&si=QKt4jg5kYQ-9Z5w0

Atoms are not all the same size. The relative sizes 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.

Sections:
00:00 - Introduction to atomic radii trends
00:28 - Atomic radius down a group increases
01:42 - Shielding and energy levels
02:04 - Atomic radius across a period decreases
02:50 - Nuclear charge and electron attraction
03:20 - Visual confirmation using atomic radius graph
04:16 - Radius trends confirmed across groups and periods

------------------

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc

Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc

Credits:
Graph created with Desmos, CC-BY-SA-4.0