Changes

===Ionic Compounds===

===Ionic Compounds===

The names of ionic compounds are based on the names of the ion which they are composed.  For example, NaCl is called sodium chloride after the Na⁺ or sodium ion, and the Cl^- or chloride ion.  The positive ion is always named first and listed first in writing the formula for the compound.  The negative ion is named and written last.  To see how the names of these ions arise, consider first the naming of positive ions, also called cations.  Ions may be monatomic (composed of a single atom) or polyatomic (formed from two or more atoms).  Monatomic cations are most commonly formed from metallic elements.<br>

The names of ionic compounds are based on the names of the ion which they are composed.  For example, NaCl is called sodium chloride after the Na⁺ or sodium ion, and the Cl^- or chloride ion.  The positive ion is always named first and listed first in writing the formula for the compound.  The negative ion is named and written last.  To see how the names of these ions arise, consider first the naming of positive ions, also called [[cation]]s.  Ions may be monatomic (composed of a single atom) or polyatomic (formed from two or more atoms).  Monatomic cations are most commonly formed from metallic elements.<br>

These ions take the name of the element itself:

These ions take the name of the element itself:

:Na⁺    Sodium ion

:Na⁺    Sodium ion