CHEM 0110 Chapter 8: Notes - Electron Configurations and Periodicity (Ebbing and Gammon)
Document Summary
Marie curie - discovered radium, isolated pure metallic element. Mendeleev - elements arranged in particular way by columns (elements in same column displaying similar properties) Periodic table - based on observed chemical and physical properties of the elements and their compounds. First 3 quantum numbers = characterize the orbital that describes the region of space where an electron is most likely to be found. Spin quantum number = describes the spin orientation of an electron. Subshell consists of a group of orbitals have same n and l but. **when an electron is subjected to an external magnetic field, it will:*: act like a tiny magnet, align its spin with the external magnetic field. It takes energy for electrons to fill up: they repel each other. More energetically favorable for electron to not pair up (recall chromium) Before pairing electrons, there must be 1 in each orbital of subshell.
