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Naming Monatomic Anions and Systematic Names for Anions

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Monatomic Anions

Systematic Naming of Anions

Monatomic anions are negatively charged ions formed from single atoms. Their systematic names are derived by modifying the element's base name and adding the suffix -ide.

  • Base Name: The root of the element's name.

  • Suffix: Add -ide to the base name.

  • Charge: The charge is indicated by the ion's superscript.

Example Table: Common Monatomic Anions

Element

Base Name

Anion Name

Symbol

Fluorine

fluor

fluoride

F-

Chlorine

chlor

chloride

Cl-

Bromine

brom

bromide

Br-

Iodine

iod

iodide

I-

Oxygen

ox

oxide

O2-

Sulfur

sulf

sulfide

S2-

Selenium

selen

selenide

Se2-

Phosphorus

phosph

phosphide

P3-

Nitrogen

nitr

nitride

N3-

Example: Naming the Selenide Ion

  • Symbol: Se2-

  • Name: Selenide ion

  • Systematic Name: Selenide

  • Formation: Selenium atom gains two electrons to form Se2-.

Example Equation:

Practice: Identifying the Oxide Ion

  • Symbol: O2-

  • Name: Oxide ion

  • Explanation: Oxygen atom gains two electrons to form O2-.

Practice: Naming Ionic Compounds

When naming ionic compounds, the cation (positive ion) is named first, followed by the anion (negative ion) with its modified ending.

  • Example: Magnesium ion (Mg2+) and Phosphide ion (P3-) combine to form magnesium phosphide.

  • Formula:

  • Systematic Name: Magnesium phosphide

Additional info: The notes also reference the importance of recognizing the correct charge and name for each ion when forming compounds.

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