CH 320M Chapter Notes - Chapter 1: Electronegativity, Ionization Energy, Atomic Orbital
Document Summary
Atom - small, dense nucleus made of neutrons and protons. Most of the mass is in its nucleus. Shells - regions of space where you can find an electron. Identified by principle quantum numbers (1, 2, 3, etc. ) Energy of electrons in shells are quantized [only specific values of energy are possible] Divided into subshells (letters s, p, d and f) Orbital - region of space that can hold 2 electrons and has a specific quantized energy. Wavelike nature of an electron that prefers to be delocalized. Delocalization - spreading of electron density over a larger volume space. Periodic table representing s, p, d, and f blocks: Ground-state electron configuration- the lowest energy electron configuration for an atom or molecule. 3 rules to figure out the configuration of an atom/molecule: Orbitals fill in order of increasing energy i. ii. Concerned with first, second, and third periods of the table. Rule 2: the pauli exclusion principle a. b.
