Ionic Compound Naming and Formulas

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Questions and Answers

What is the correct name for the ionic compound NaCl?

  • Sodium chloride (correct)
  • Sodium oxide
  • Sodium fluoride
  • Sodium bromide

The criss-cross method is applicable to all types of compounds.

False (B)

Name the anion in the ionic compound MgO.

Oxide

The formula for potassium bromide is __________.

<p>KBr</p>
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Match the following elements with their ionic charges:

<p>Chromium (II) = Cr2+ Iron (III) = Fe3+ Copper (II) = Cu2+ Zinc = Zn2+</p>
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What does the Stock system identify?

<p>The ionic charge of metals with varying charges (B)</p>
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Silver forms only one type of cation.

<p>True (A)</p>
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What suffix indicates a higher charge in the classical system?

<p>-ic</p>
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The anion derived from sulfur is called __________.

<p>sulfide</p>
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Flashcards

Ionic Compound

A compound composed of positively charged ions (cations) and negatively charged ions (anions).

Binary Ionic Compound

An ionic compound made up of two different elements — one cation and one anion.

Naming Cations

Use the element's name directly.

Naming Anions

Change the ending to '-ide'.

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Criss-Cross Method

A method to determine subscripts in ionic formulas by using ion charges.

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Stock System

A naming system using Roman numerals to indicate the charge of multivalent cations.

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Classical System

A naming system using suffixes to show different charges of transition metal cations.

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Transition Metals

Metals that can have multiple positive charges/ions, unlike other representative elements.

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Study Notes

Ionic Compound Naming and Formulas

  • Ionic compounds are composed of cations (positive ions) and anions (negative ions).
  • Binary ionic compounds contain two elements. Examples include NaCl (sodium chloride), KBr (potassium bromide), and ZnS (zinc sulfide).

Steps for Naming Ionic Compounds

  • Identify the cation and anion.
  • Name the cation using the element name (e.g., sodium).
  • Name the anion by changing the ending to "-ide" (e.g., fluorine becomes fluoride).
  • Write the cation first, then the anion.

Criss-Cross Method

  • Used to determine the formula of an ionic compound.
  • The charge of one element becomes the subscript (number of atoms) of the other.

Transition Metals and Variable Charges

  • Many transition metals (and some Group 4A metals) can form different positive ions with varying charges.
  • Representative elements have fixed charges.

Charges of Some Transition and Group 4A Metals

  • Transition Metals: Cr2+, Cr3+, Fe2+, Fe3+, Cu+, Cu2+, Ag+, Au+, Au3+, Zn2+, Cd2+
  • Group 4A Metals: Sn2+, Sn4+, Pb2+, Pb4+

Stock System

  • Used for metals with multiple possible charges.
  • The charge of the metal is indicated by a Roman numeral in parentheses after the metal's name (e.g., Chromium(II), Chromium(III)).

Classical System

  • Used for metals with multiple possible charges.
  • Uses Latin names and suffixes "-ic" (higher charge) and "-ous" (lower charge) (e.g., Fe3+ is ferric, Fe2+ is ferrous).

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