Sophia Learning
Sophia: Period Trends: Ionic Size: Lesson 1
This lesson will explain how the ionic radius changes over representative elements across rows and up and down columns on the periodic table. It is 1 of 3 in the series titled "Period Trends: Ionic Size."
Sophia Learning
Sophia: Ions: Lesson 1
This lesson will define an ion and explain what happens if the number of electrons in an atom changes. It is 1 of 3 in the series titled "Ions."
Other
Oxford Dictionaries: Words Ending in Sion, Tion, and Cion
Learn the spelling rules involving when to use an "s," "t," or "c" when adding an "ion" suffix.
MadSci Network
Mad Scientist Network: Nonproduction of Oxygen
From the Mad Scientist Network, this page (and its accompanying answer page) use a question and answer format to help explain the results of an electrolysis of water experiment. Helpful tips for performing such an experiment are given.