State that an ionic bond is a strong electrostatic attraction between oppositely charged ions

Atoms, Elements and Compounds – Ions and Ionic Bonds

Objective

State that an ionic bond is a strong electrostatic attraction between oppositely charged ions. 🌟

What is an Ion?

An ion is an atom that has gained or lost one or more electrons, giving it a net electric charge.

  • Positive ion (cation): loses electrons, e.g. \$Na^+\$.

  • Negative ion (anion): gains electrons, e.g. \$Cl^-\$.

How Ionic Bonds Form

Think of ions like magnetic hands that reach out and grab each other. When a metal atom (like sodium) gives up an electron, it becomes a positively charged cation. A non‑metal atom (like chlorine) accepts that electron, becoming a negatively charged anion. The opposite charges attract strongly, creating an ionic bond.

Analogy: Imagine two people holding a rope. One pulls the rope tight, and the other pulls back. The tension that keeps them together is like the electrostatic attraction between ions.

Common Ionic Compounds

CompoundFormulaIons Involved
Table Salt\$NaCl\$\$Na^+\$ + \$Cl^-\$
Magnesium Oxide\$MgO\$\$Mg^{2+}\$ + \$O^{2-}\$
Calcium Fluoride\$CaF_2\$\$Ca^{2+}\$ + \$2F^-\$

Exam Tips

Remember:

  1. Identify the cation (metal) and anion (non‑metal) in a formula.

  2. Use the charge balance rule: total positive charge = total negative charge.

  3. When asked to draw an ionic compound, show the ions and the strong electrostatic attraction between them.

  4. Practice writing formulas from names and vice versa.

Good luck! 🚀

Quick Quiz

  1. What is the charge on a calcium ion?

  2. Write the formula for potassium chloride.

  3. Explain why sodium and chlorine form an ionic bond.