Common Cations and Anions: Essential Reference for Ionic Compounds

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Ionic Compounds

Common Cations

Ions are atoms or molecules that carry an electric charge due to the loss or gain of electrons. Cations are positively charged ions formed when atoms lose electrons. Understanding common cations is fundamental for naming and writing formulas of ionic compounds in chemistry.

Charge: Cations are classified by their positive charge (e.g., 1+, 2+, 3+).
Formula: The chemical symbol with charge notation (e.g., Na+).
Name: The systematic or common name of the ion (e.g., sodium ion).
Examples: Hydrogen ion (H+), sodium ion (Na+), calcium ion (Ca2+), iron(III) ion (Fe3+).

Below is a table summarizing the most common cations encountered in introductory chemistry:

Table of common cations with charge, formula, and name

Key Points:

Monatomic cations are named by adding "ion" to the element name (e.g., potassium ion).
Polyatomic cations include ions like ammonium (NH4+).
Transition metals often form more than one cation, distinguished by Roman numerals (e.g., iron(II) vs. iron(III)).

Example: The copper(I) ion is Cu+, while copper(II) is Cu2+.

Common Anions

Anions are negatively charged ions formed when atoms gain electrons. Recognizing common anions is essential for constructing and naming ionic compounds.

Charge: Anions are classified by their negative charge (e.g., 1-, 2-, 3-).
Formula: The chemical symbol with charge notation (e.g., Cl-).
Name: The systematic or common name of the ion (e.g., chloride ion).
Examples: Fluoride ion (F-), sulfate ion (SO42-), phosphate ion (PO43-).

Below is a table summarizing the most common anions encountered in introductory chemistry:

Table of common anions with charge, formula, and name

Key Points:

Monatomic anions are named by replacing the element's ending with "-ide" (e.g., chloride, oxide).
Polyatomic anions have specific names (e.g., nitrate, sulfate, phosphate).
Some polyatomic ions have multiple forms distinguished by prefixes and suffixes (e.g., chlorate, perchlorate).

Example: The sulfate ion is SO42-, while the sulfite ion is SO32-.

Summary Table: Cations and Anions

The following HTML tables summarize the main cations and anions from the images above:

Common Cations

Charge	Formula	Name	Formula	Name
1+	H+	hydrogen ion	NH4+	ammonium ion
	Li+	lithium ion	Cu+	copper(I) or cuprous ion
	Na+	sodium ion
	K+	potassium ion
	Cs+	cesium ion
	Ag+	silver ion
2+	Mg2+	magnesium ion	Co2+	cobalt(II) or cobaltous ion
	Ca2+	calcium ion	Cu2+	copper(II) or cupric ion
	Sr2+	strontium ion	Fe2+	iron(II) or ferrous ion
	Ba2+	barium ion	Mn2+	manganese(II) or manganous ion
	Zn2+	zinc ion	Hg2+	mercury(II) or mercuric ion
	Cd2+	cadmium ion	Hg22+	mercury(I) or mercurous ion
			Ni2+	nickel(II) or nickelous ion
			Pb2+	lead(II) or plumbous ion
			Sn2+	tin(II) or stannous ion
3+	Al3+	aluminum ion	Cr3+	chromium(III) or chromic ion
			Fe3+	iron(III) or ferric ion

Common Anions

Charge	Formula	Name	Formula	Name
1-	H-	hydride ion	CH3COO- (or C2H3O2-)	acetate ion
	F-	fluoride ion	ClO3-	chlorate ion
	Cl-	chloride ion	ClO4-	perchlorate ion
	Br-	bromide ion	NO3-	nitrate ion
	I-	iodide ion	MnO4-	permanganate ion
	CN-	cyanide ion
	OH-	hydroxide ion
2-	O2-	oxide ion	CO32-	carbonate ion
	O22-	peroxide ion	CrO42-	chromate ion
	S2-	sulfide ion	Cr2O72-	dichromate ion
			SO42-	sulfate ion
			SO32-	sulfite ion
3-	N3-	nitride ion	PO43-	phosphate ion

Additional info: These tables are essential for GOB Chemistry students to master the naming and formula writing of ionic compounds, which is foundational for later topics such as chemical reactions, solution chemistry, and acid-base chemistry.