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An ion is a charged atom and is formed when an atom gains or loses electrons.
A cation is a positively charged ion. How is the ion's original number electrons altered to give a positive charge?
To name a cation, you generally name the ion by the name of the element and the word "ion". For example, "sodium ion"
An anion is a negatively charged ion. How is an anion formed?
To name an anion, you generally name the ion by dropping the ending of the element's name and adding -ide. For example, the ion of chlorine is chloride.
Why do atoms form ions? (hint: think about the number of electrons in the ion versus the atom)
How can we predict which elements will form anions and cations based on their location on the periodic table?
What ion does sodium form? What type of ion is it?
For guidance in answering these question or for more information on anions and cations, visit the links embedded in the respective topics above.