Ion Posted on 1st December 20155th October 2020 by ThePD (The Project Definition) An Ion is an electrically charged particle which has gained or lost one or more electrons. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Substance and tagged chemistry, substance. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.