Table of Contents

  1. Welcome to Chemistry!

    Believe it or not you're living in a world of chemistry

  2. Matter

    Matter has mass, occupies some volume in space, and exists in different states



  3. Subatomic particles

    Subatomic particles make up atoms. There're different types of subatomic particles, and they have different properties

    Subatomic particles


    Compounds or Mixtures?


    Nuclear symbol

    Atomic mass

    Mass spectrometry

    History of atomic models

  4. Electron Configuration

    Let's understand how electrons are allocated in the atom, as this is essential for chemists to predict the chemical properties of elements

    Electron Configuration

    Electromagnetic waves

    Electromagnetic spectrum

    Electron transit in hydrogen atoms

    The modern way: quantum mechanical model

    Electron configuration: with quantum mechanical model

    Writing electron configuration

    Shapes of orbitals

  5. Periodicity

    The periodic table tells us some periodical trends in some properties of elements, and we name these trends as periodicity


    Periodicity I: the atomic radius

    Periodicity II: the ionic radius

    Periodicity III: ionization energy