https://www.khanacademy.org/science/biology/history-of-life-on-earth/radiometric-dating/a/atomic-number-atomic-mass-and-isotopes-article 2021-04-29T07:51:16Z Atomic number, atomic mass, and isotopes Fundamental properties of atoms including atomic number and atomic mass. The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons. article https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:structure-of-the-atom/x46dd29ce84a663ea:atomic-number-mass-number-isotopes-and-isobars/v/isobars 2023-06-26T12:36:08.867767149Z Isobars We've seen atoms of same elements with same atomic number but different atomic masses, but now, let's have a look at atoms of different elements with same atomic mass! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Isobars We've seen atoms of same elements with same atomic number but different atomic masses, but now, let's have a look at atoms of different elements with same atomic mass! https://cdn.kastatic.org/ka-youtube-converted/9xwmJ_aI-6o.mp4/9xwmJ_aI-6o.mp4 149 Atomic and mass number, Isotopes and Isobars https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:measurement-of-matter/x345505a97fc4a662:atoms-and-molecules/v/average-atomic-mass-in 2025-05-24T09:35:11.484794851Z Average atomic mass Let's learn how to calculate average atomic mass! Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Average atomic mass Let's learn how to calculate average atomic mass! https://cdn.kastatic.org/ka-youtube-converted/7zdYjYtzJjs.mp4/7zdYjYtzJjs.mp4 518 Atomic and mass number, Isotopes and Isobars https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:measurement-of-matter/x345505a97fc4a662:atoms-and-molecules/v/worked-example-atomic-weight-calculations 2025-05-29T08:44:44.739717086Z Worked example: Atomic weight calculations Let's learn how to calculate atomic weight from atomic mass and percent abundance of carbon isotopes. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Worked example: Atomic weight calculations Let's learn how to calculate atomic weight from atomic mass and percent abundance of carbon isotopes. https://cdn.kastatic.org/ka-youtube-converted/3CYWrAZ4hME.mp4/3CYWrAZ4hME.mp4 267 Atomic and mass number, Isotopes and Isobars https://www.khanacademy.org/science/strengthened-shs-chemistry-1/x174677b2bfa4bea2:1st-quarter/x174677b2bfa4bea2:examples-of-isotopes/v/worked-example-identifying-isotopes-and-ions-dubv 2025-05-29T08:44:44.739717086Z Worked example: Identifying isotopes and ions Let's figure out how to identify isotopes and ions from the number of electrons, protons and neutrons, and vice versa. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Worked example: Identifying isotopes and ions Let's figure out how to identify isotopes and ions from the number of electrons, protons and neutrons, and vice versa. https://cdn.kastatic.org/ka-youtube-converted/RlegO58V8Bg.mp4/RlegO58V8Bg.mp4 224 Atomic and mass number, Isotopes and Isobars https://www.khanacademy.org/science/class-9-chemistry/x46dd29ce84a663ea:structure-of-the-atom/x46dd29ce84a663ea:atomic-number-mass-number-isotopes-and-isobars/e/isotopes-and-isobars 2026-04-08T08:09:55.69362548Z Isotopes and Isobars Let's solve a few problems to understand the concept of isotopes and isobars. Aanchal Arora exercise