Courses
Teacher-curated, self-paced courses. Looking for a guided sequence through a full topic? See Learning Paths.
2 courses
The Nuclear Atom: Particles, Nucleus and Isotopes
Chemistry · High School (11–12) · Subatomic Particles and Atomic Models, Isotopes and Isobars
FreeCh 2 · 1/4
How do you weigh something that no one has ever seen? Thomson, Millikan and Rutherford did it with glowing tubes, oil drops and a thin gold foil. In this course we see how the electron, the proton and the neutron were found, how big the nucleus is, and how a mass spectrometer finds the isotopes of an element.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Inside the Atom: Particles and Models
Chemistry · High School (9–10), General · Subatomic Particles and Atomic Models
FreeCh 4 · 1/3
The atom is not a solid ball. It has smaller particles, and scientists found them one by one. In this course we meet the electron, the proton and the neutron, and we follow the models of Thomson, Rutherford and Bohr, each one built on the failure of the one before.
3Lessons10Problems2Python Labs1Question Set1Mock Test