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  1. Isotopes and mass spectrometry (article) | Khan Academy

    The isotopes of a given element always contain the same number of protons and therefore occupy the same place on the periodic table. However, because isotopes contain different …

  2. Mass spectrometry (video) | Khan Academy

    What percentage of an element that we find in the universe is of isotope A versus, say, isotope B? And the answer to your question is they use a technique known as mass spectrometry.

  3. Atoms, isotopes, and ions - Science | Khan Academy

    In this unit, we'll cover some of chemistry's most fundamental topics, including atoms, isotopes, and ions. We’ll learn about subatomic particles (protons, neutrons, and electrons) and how to …

  4. Isotopes (video) | Khan Academy

    Isotopes are atoms of the same element with different numbers of neutrons. Because they contain different numbers of neutrons, isotopes have different atomic masses. The average atomic …

  5. Worked example: Identifying an element from its mass spectrum

    In this video, the most massive isotope of the element will be deflected the least in the mass spectrometer, but collide most with the detector in a certain spot to show that it is the most …

  6. Isotopes (video) | Atoms, isotopes, and ions | Khan Academy

    Stable isotopes exist for many of the first 80 elements, while some elements have both stable and unstable (radioactive) isotopes. The total number of isotopes for each element is limited; most …

  7. Mass spectrometry of elements (practice) | Khan Academy

    B The element has an average atomic mass between 24 ‍ and 25 u ‍ . C The most abundant isotope of the element has an atomic mass of 26 u ‍ . D An average sample of the element …

  8. The periodic table, electron shells, and orbitals - Khan Academy

    In addition to listing the atomic number for each element, the periodic table also displays the element’s relative atomic mass, the weighted average for its naturally occurring isotopes on …

  9. Isotopes (apply) (practice) | Khan Academy

    Which pair of atoms are isotopes of the same element? Choose 1 answer: A A 2 3 A 2 2 2 3 X and A 2 4 A 2 2 2 4 X

  10. Isotopes and Isobars (practice) | Khan Academy

    > Isotopes and Isobars Google Classroom Microsoft Teams The compositions of nuclei of two atoms X and Y are given: