A monatomic ion (also called simple ion[1][2]) is an ion consisting of exactly one atom. If, instead of being monatomic, an ion contains more than one atom, even if these are of the same element, it is called a polyatomic ion.[3] For example, calcium carbonate consists of the monatomic cation Ca2+ and the polyatomic anion CO2−
3; both pentazenium (N+5) and azide (N−3) are polyatomic as well.

A type I binary ionic compound contains a metal that forms only one type of ion. A type II ionic compound contains a metal that forms more than one type of ion, i.e., the same element in different oxidation states.

Common type I monatomic cations
Hydrogen H+
Lithium Li+
Sodium Na+
Potassium K+
Rubidium Rb+
Caesium Cs+
Magnesium Mg2+
Calcium Ca2+
Strontium Sr2+
Barium Ba2+
Aluminium Al3+
Silver Ag+
Zinc Zn2+
Common type II monatomic cations
iron(II) Fe2+ ferrous
iron(III) Fe3+ ferric
copper(I) Cu+ cuprous
copper(II) Cu2+ cupric
cobalt(II) Co2+ cobaltous
cobalt(III) Co3+ cobaltic
tin(II) Sn2+ stannous
tin(IV) Sn4+ stannic
Common monatomic anions
hydride H−
fluoride F−
chloride Cl−
bromide Br−
iodide I−
oxide O2−
sulfide S2−
nitride N3−
phosphide P3−

References

  1. ↑ admin (2018-01-10). "List of Polyatomic Ions and Charges - Freakgenie". Retrieved 2022-04-13.
  2. ↑ Chapter 3: !Ions, Compounds, and Nomenclature
  3. ↑ William Masterton; Cecile Hurley (24 January 2008). Chemistry: Principles and Reactions. Cengage Learning. p. 176. ISBN 978-0-495-12671-3.
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