No one was fully prepared for school closures. With fall on the horizon, Khan Academy wants to help educators be ready for anything and head into the new school year with a plan! Meaghan Pattani, Khan Academy’s U.S. Professional Learning Lead, is joining Homeroom with Sal on Tuesday at noon PT to talk about our brand-new teacher education program. Khan For Educators is 100% free, just like Khan Academy, and helps educators get ready for both in-person and online teaching. Learn more about the program and get your questions answered. For more information visit: keeplearning.khanacademy.org Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. If you’d like to contribute, please visit: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=live&utm_campaign=schoolclosers ... https://www.youtube.com/watch?v=yh_lredn1MY Note: All Khan Academy content is available for free at (www.khanacademy.org)

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. 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 ... https://www.youtube.com/watch?v=HDniYwGEl0o Note: All Khan Academy content is available for free at (www.khanacademy.org)