1. Atoms (12 lessons)

Concepts Matter is made of atoms.  Atoms consist of a dense nucleus containing protons (p+) and neutrons (n), and the electrons (e-) that “orbit” this nucleus. According to the Bohr model of the atom, electrons exist in discrete “orbits” (energy levels) around the nucleus of an atom.  Each energy level can contain a maximum numberContinue reading “1. Atoms (12 lessons)”