Ionic Bond Examples in Chemistry

Start with the recap, study the fully worked examples, then use the practice problems to check your understanding of Ionic Bond.

This page combines explanation, solved examples, and follow-up practice so you can move from recognition to confident problem-solving in Chemistry.

Concept Recap

A chemical bond formed by the electrostatic attraction between oppositely charged ions, created when one atom transfers one or more electrons to another atom.

One atom gives electrons away; another takes them. Opposites attract.

Read the full concept explanation →

How to Use These Examples

  • Read the first worked example with the solution open so the structure is clear.
  • Try the practice problems before revealing each solution.
  • Use the related concepts and background knowledge badges if you feel stuck.

What to Focus On

Core idea: Ionic bonds form between metals (lose electrons) and nonmetals (gain electrons).

Common stuck point: There's no 'molecule' of \text{NaCl}—it's a crystal lattice of ions.

Sense of Study hint: When identifying ionic bonds, check the atoms involved. First determine if one atom is a metal and the other a nonmetal — this strongly suggests ionic bonding. Then check the electronegativity difference — values greater than 1.7 typically indicate ionic character. Finally, visualize the electron transfer: the metal loses electrons to become a cation, the nonmetal gains them to become an anion.

Worked Examples

Example 1

easy
Show how magnesium and oxygen form an ionic bond in \text{MgO}.

Solution

  1. 1
    Mg (Group 2) has 2 valence electrons. It loses both to form \text{Mg}^{2+}.
  2. 2
    O (Group 16) has 6 valence electrons. It gains 2 electrons to form \text{O}^{2-}.
  3. 3
    The electrostatic attraction between \text{Mg}^{2+} and \text{O}^{2-} forms the ionic bond in MgO.

Answer

\text{Mg} \rightarrow \text{Mg}^{2+} + 2e^-;\quad \text{O} + 2e^- \rightarrow \text{O}^{2-}
Ionic bonds form when electrons are transferred from a metal to a nonmetal, creating oppositely charged ions that attract each other. The ratio of ions ensures overall electrical neutrality.

Example 2

medium
Predict the formula of the ionic compound formed between aluminum and oxygen.

Practice Problems

Try these problems on your own first, then open the solution to compare your method.

Example 1

easy
Write the formula for the ionic compound formed by lithium and fluorine.

Example 2

medium
Describe how magnesium and oxygen form an ionic bond in magnesium oxide (\text{MgO}).
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Background Knowledge

These ideas may be useful before you work through the harder examples.

ionchemical bond