Polyatomic ions list

What are polyatomic ions?

Atoms form ions by loss or gain of electrons. The ions that contain a greater number of protons than electrons are known to hold a net positive charge. These ions are commonly referred to as cations. On the other hand, the ions that contain a greater number of electrons than protons are known to hold a net negative charge. These ions are commonly known as anions.

If an ion is made up of only one type of atom (each holding some net charge, positive or negative), it can be referred to as an atomic ion or a monatomic ion. On the other hand, if an ion is made up of two or more atoms, it can be referred to as a polyatomic ion or a molecular ion.

Table of contents

List of polyatomic ions

  • Ions made up of more than one atom are known as polyatomic ions.
  • Ions with positive charge are called cations.
  • Ions with negative charge are called anions.
Name Formula
Polyatomic ions (carrying negative charge)
Hydroxide OH
Acetate CH3COO
Cyanide CN
Chlorate ClO3
Chlorite ClO2
Nitrate NO3
Nitrite NO2
Hypochlorite OCl
Hypobromite OBr
Iodate IO3
Bisulphite HSO3
Bisulphate HSO4
Permanganate MnO4
Thiocyanate SCN
Hydrogen carbonate HCO3
Carbonate CO32-
Sulphate SO42-
Sulphite SO32-
Oxalate C2O42-
Silicate SiO32-
Manganate MnO42-
Thiosulphate S2O32-
Chromate CrO42-
Dichromate Cr2O72-
Phosphate PO43-
Phosphite PO33-
Aluminate AlO33-
Arsenite AsO33-
Arsenate AsO43-
Borate BO33-
Pyrophosphate P2O74-
Polyatomic ions (carrying positive charge)
Ammonium NH4+

List of monatomic ions

  • The ions made of a single atom are called simple ions or monatomic ions.
Name Formula
Monatomic ions (carrying positive charge)
Hydrogen H+
Potassium K+
Sodium Na+
Silver Ag+
Cuprous Cu+
Aurous Au+
Barium Ba2+
Calcium Ca2+
Magnesium Mg2+
Cupric Cu2+
Ferrous Fe2+
Stannous Sn2+
Mercuric Hg2+
Zinc Zn2+
Plumbous Pb2+
Aluminum Al3+
Ferric Fe3+
Auric Au3+
Arseneous As3+
Plumbic Pb4+
Stannic Sn4+
Monatomic ions (carrying negative charge)
Chloride Cl
Bromide Br
Iodide I
Oxide O2-
Sulphide S2-
Nitride N3-
Phosphide P3-

Frequently Asked Questions on Polyatomic ions list

Q1

What are 3 examples of polyatomic ions?

Examples of polyatomic ions are Acetate(CH3COO), Phosphate (PO43-), Permanganate (MnO4), Oxalate (C2O42-) etc.

Q2

What is a polyatomic element?

The is made up of two or more atoms, it can be referred to as a polyatomic ion or a molecular ion. Depending on the charge it may be classified as cations and anions

Q3

Is phosphate a polyatomic ion?

Phosphate (PO43-) is a polyatomic ion carrying a negative charge. The phosphate ion made more than one atom.

Q4

What are monatomic ions called?

The ion is made up of only one type of atom each holding some net charge, positive or negative, it can be referred to as a monatomic ion.

Q5

Is Mg2+ a polyatomic ion?

No Mg2+ ion is a monatomic ion, it is made up of only one Mg atom.

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