Physics:Monatomic ion

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Short description: Ion consisting of one atom

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.[citation needed] 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