Khan Academy: Period Trend for Electron Affinity

Electronegativity is defined and compared to electron affinity. Trends based on groups and periods are also explored. [9:54]

A description of VSEPR with 3 electron clouds and various types of molecules. [12:33]

An introduction of VSEPR and molecules with 2 electron clouds. [8:04]

Electron affinity is defined. Electron affinities of various elements are compared. [11:39]

Learn the difference between electronegativity and electron affinity. Group and period trends are also discussed in relation to atomic radii. [9:54]

A video lecture explaining the movement of the electrons around the nucleus in orbitals. Video describes the orbital's energy shell and shape. Also discussed is the connection of the location of the electrons to the periodic table. [13:37]

VSEPR for molecules with four electron clouds including examples for tetrahedral, trigonal pyramidal, and bent molecules. [10:05]

Learn about VSEPR for molecules with five electron clouds, and see examples for trigonal bipyramidal and seesaw-shaped molecules. [14:47]

Part II of using VSEPR for five electron clouds including examples for T-shaped and linear molecules. [10:48]

Learn about VSEPR for six electron clouds, and see examples for octahedral, square pyramidal, and planar molecules. [12:29]