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:isotopes-and-ions/v/hs_isotopes

Want to explore more? Check out the full Atoms, isotopes, and ions playlist here: https://youtube.com/playlist?list=PLSQl0a2vh4HBSf5CVmr7BQ-DAayIsE71N&si=n5y_agsm1Gc3CdM-

Isotopes are atoms of the same element with different numbers of neutrons. Since isotopes of an element have different numbers of neutrons, they also have different masses. The sum of the number of neutrons and protons in an atom is called its mass number. Isotopes can be represented in writing using isotope notation.

Sections:
00:00 - Elements and atomic number
00:29 - What are isotopes?
00:59 - Introduction to isotope notation
01:24 - Isotope notation for carbon
02:49 - Hyphen notation for isotopes
03:26 - Recap: Isotopes and their notations

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

Volunteer here: https://www.khanacademy.org/contribute

Credits:

“Kalium” by BXXXD, licensed under a Creative Commons Attribution License (CC BY-SA 3.0):
https://commons.wikimedia.org/wiki/File:Kalium.jpg
https://creativecommons.org/licenses/by-sa/3.0/deed.en

“Cobalt-3” by Unknown author, licensed under a Creative Commons Attribution License (CC BY 1.0):
https://commons.wikimedia.org/wiki/File:Cobalt-3.jpg
https://creativecommons.org/licenses/by/1.0/deed.en

“Graphite-and-diamond-with-scale” by Robert M. Lavinsky, licensed under a Creative Commons Attribution License (CC BY-SA 3.0):
https://commons.wikimedia.org/wiki/File:Graphite-and-diamond-with-scale.jpg
https://creativecommons.org/licenses/by-sa/3.0/deed.en