Chemistry
High School (9–10)
General
Structure of the Atom › Isotopes and IsobarsStructure of the Atom › Subatomic Particles and Atomic ModelsStructure of the Atom › Electronic Configuration and ValencyChapter 4Structure of the Atom
In the last chapter the atom was the smallest piece of an element that we counted. But is the atom really the end of the road? In this chapter we open it up. We meet the three particles inside it, and we follow the experiments that gave us the nucleus. We learn how the electrons are arranged in shells, why this decides how an atom combines with others, and why two atoms of the same element can have different masses. Python helps us with the counting.
Part of Chemistry · High School (9–10) (chapter 4)
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Inside the Atom: Particles and Models
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.
Electron Shells, Valency and Atomic Number
Electrons sit in shells, and the outer shell decides how an atom behaves. Here we learn the rules for filling the shells, how to find the valency of an atom, and how the atomic number and the mass number tell us the particles in an atom.