Module 3: Modern Atomic Theory, Electron Structure, and Periodicity

The view of the atom has evolved greatly over the past one hundred years. Advancements in the study of light led to a modern atomic model. This modern model, or Bohr Model, was based on the spectra of light emitted by each element. In this module, you will investigate the modern atomic model and the role that electrons play in determining atomic behavior and reactivity. During this exploration, you will observe the correlation between atomic structure, behavior, and the elements' locations on the periodic table. Remember, the periodic table is not only used as a reference, but it is also used to help predict chemical behavior and provide a basis for comparing the reaction tendencies of various types of elements.

Getting Started

Take a few minutes to consider the following fact. The potassium in a banana is only one electron away from being an explosive metal. The banana would then react with the saliva in your mouth creating a painful explosion. Although electrons are extremely small subatomic particles, they have a very important function by helping to determine the characteristics of the atom.

 

Key Vocabulary

To view the definitions for these key vocabulary terms, visit the course glossary.

abbreviated electron configuration	electronegativity	photoelectric effect
amplitude	energy	photon
anion	frequency	principle energy levels
anode	ground state	quantum
atomic orbital	hertz	quantum mechanics
atomic radius	Hund's Rule	quantum numbers
Aufbau Principle	ion	refraction
Bohr model	ionization energy	shielding effect
cathode	joule	spectrum
cation	mole	sub-levels
Coulomb's Law	noble gases	transition metals
crest	orbital diagram	trough
effective nuclear charge	oxidation	valence electrons
electron configuration	Pauli Exclusion Principle	wavelength
electron spin	Periodic Law