Unit 1: Atomic Structure and Properties

Topic 1.1 Moles and Molar Mass

• Introductory Lecture Notes - Moles and Molar Mass These lecture notes introduce the idea of an atomic mass in amu's and how using the units of grams with atomic mass is the mass of mol of an element. The notes go further with the idea of molar mass and provides some sample calculations.

Topic 1.2 Mass Spectroscopy of Elements

• Isotopic Abundances of the Elements This website shares the isotopic abundances for elements in the periodic table.

• Here is a guided inquiry activity that can be used to invent weighted average calculations that are used to calculate percent abundance or average weighted atomic masses.

Topic 1.3 Elemental Composition of Pure Substances

• Introductory Lecture Notes - Percent Composition and Empirical Formula These lecture notes introduce formulas, percent composition and empirical formula calculations.

Topic 1.4 Composition of Mixtures

Topic 1.5 Atomic Structure and Electron Configuration

• Bohr Model of a hydrogen atom This movie shows four energy levels for a hydrogen atom and what happens when the atom absorbs and releases a photon of light. This is a movie of a Java applet from the University of Colorado.

• Introductory Lecture Notes - Electron Configurations These lecture notes introduce electron configuration for elements in the periodic table, along with discussions of orbital diagrams and energy level diagrams.

• Electron Energy Level Diagram This HTML5 animation depicts an energy level diagram and an orbital diagram from hydrogen through Uranium in the periodic table.

• Multi-Electron Energy Level Diagram Multi-electron Energy Level Diagram (showing how the energy of an electron in a particular subshell changes with increasing protons (and electrons).

Topic 1.6 Photoelectron Spectroscopy

• PES for Elements 1 - 21 This link shows individual Photoelectron spectra of the fist twenty-one elements.

• Some examples of PES questions This link shows several sample PES questions.

Topic 1.7 Periodic Trends

• Periodic Properties Lecture Notes This link provides trend information for atomic radii, ionization energy, ionic radii and electron affinity.

Topic 1.8 Valence Electrons and Ionic Compounds

• Hybrid Orbitals in CH₄, BH₃, BeH₂, C₂H₄, and C₂H₂

• VSEPR Examples of Molecular Geometries

• Models 360 Software from the ChemEd Digital Library that displays molecular geometry for a large collections of covalent comounds.

• Introductory Lecture Notes - Covalent Bonding

  This link contains introductory lecture notes for covalent bonds. Covalent bonds form from the overlap of atomic and/or hybrid orbitals. The notes describe how bonding in diatomic compounds and be described using atomic orbitals and more complicated compounds where covalent bonds involve the overlap of hybrid orbitals.

• Introductory Lecture Notes - VSEPR

  This link contains lecture notes introducing the molecular geometries and bond angles for covalent compounds with central atoms with different combinations of bonding domains and nonbonding domains.