Ionic Nomenclature & Compounds

Ionic Nomenclature Komperda

Rules for Formulas
All atoms must achieve stable electron configuration (full valence)
The formula must be electrically neutral
The sum of the positive and negative charges must equal zero

How do we name our formulas?
Name the cation first, then the anion
Do not include the numbers in the name
Example:
BaCl 2 = Barium Chloride

Transition Metals
Form more than one type of cation
Must use Roman Numerals to distinguish which cation is in the formula
Roman Numerals are ONLY used in the NAME, not in the formula
The Roman Numeral stands for the charge on the cation, NOT THE SUBSCRIPT in the formula

Formula vs. Name
FeN = Iron (III) Nitride
Cu 2 O = Copper (I) Oxide
SnO = Tin (II) Oxide
SnO 2 = Tin (IV) Oxide

How do I figure out what to name it?

What do Ionic Compounds look like?
Ionic compounds form salts
Think of table salt
Cations are smaller than the parent atom
Anions are bigger than the parent atom
The compounds formed become tightly packed spheres of atoms

Sizes of Ions

The Positions of the Centers of the atoms form a matrix

Review
Simple Binary Ionic Compounds use the simple names of the ions
Transition Metals with more than one charge use Roman Numerals in the name, not in the formula
Names and formulas are cation first, then the name of the anion

Ionic Nomenclature & Compounds

by Regis Komperda

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