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Ionic bonding occurs between metals and non-metals, while covalent bonding occurs between non-metal atoms. Free notes with key terms and 10 questions answered.
Where Different Types of Bonding Occur is part of Chemical bonds, ionic, covalent and metallic in GCSE AQA Higher Chemistry.
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Ionic bonding occurs between metals and non-metals, while covalent bonding occurs between non-metal atoms. Free notes with key terms and 10 questions answered.
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Use this lesson to stay inside Chemical bonds, ionic, covalent and metallic while connecting the detail back to the wider Topic 2: Bonding, structure, and the properties of matter topic.
Read the core explanations from Where Different Types of Bonding Occur before testing yourself from memory.
Look around you right now. The salt on your table, the water you drink, the copper wire in your phone charger - they all hold together differently. The secret lies in what types of atoms are involved.
There's a simple pattern that determines which type of bonding occurs. It's all about whether you're dealing with metals, non-metals, or both. Once you crack this code, you'll predict bonding types instantly.
Picture sodium (a shiny metal) meeting chlorine (a poisonous gas). The sodium atom gives up an electron to become Na⁺, while chlorine grabs it to become Cl⁻. These oppositely charged ions pull together like magnets - that's your table salt, NaCl.
**Trap**: Many students think ionic bonding happens between any two different elements. Actually, it's specifically metals + non-metals. Two non-metals together won't do ionic bonding - they share electrons instead.
When non-metals meet other non-metals, they're too similar to transfer electrons. Instead, they share. Think of two friends sharing a pizza - both get what they need without giving anything up permanently.
This happens in two main situations: between atoms of the same non-metal element (like O₂ or Cl₂), and between different non-metals in compounds (like H₂O or CO₂). The key is no metals involved.
Imagine metal atoms as islands in a sea of electrons. The electrons don't belong to any particular atom - they're free to move around. This 'electron sea' acts like glue, holding all the metal atoms together.
This happens in pure metals (like copper wire or iron nails) and in alloys (mixtures of metals like steel or brass). The moving electrons explain why metals conduct electricity and heat so well.
Worked example: Identifying Bonding Types
What type of bonding occurs in: (a) CaF₂ (b) N₂ (c) Steel?
Answer: (a) Ionic bonding (b) Covalent bonding (c) Metallic bonding
The pattern is beautifully simple: metals with non-metals give ionic, non-metals together give covalent, and metals (pure or mixed) give metallic. This decision tree works for any substance you encounter.
Examiners test this topic by giving you a substance and asking you to identify the bonding type. They're looking for your reasoning, not just the answer. Here's how to nail those marks every time.
**Common exam trap**: Questions about compounds like hydrogen chloride. In the gas phase, HCl has covalent bonding (both non-metals). When dissolved in water, it forms H⁺ and Cl⁻ ions, but the original H-Cl bond was still covalent.
Exam precision note: Exam tip: identify whether the substances are metals or non-metals first, then use that to decide whether bonding is ionic, covalent, or metallic., always identify the key chemical idea first, then link it to evidence, data, or an equation. A high-scoring GCSE answer names the particles involved, states what changes, and justifies the conclusion using correct scientific language. Where calculations are used, show each step with units and keep significant figures sensible. Finally, check that terminology matches AQA wording so your answer is unambiguous and mark-scheme friendly.
Different types of bonding occur in different kinds of substances. Ionic bonding happens between metals and non-metals because electrons are transferred. Covalent bonding happens between non-metals because electrons are shared. Metallic bonding happens in metals and alloys because positive ions are held together by delocalised electrons.
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Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.
Hydrogen chloride (HCl) has covalent bonding because hydrogen and chlorine are both non-metals. When dissolved in water it forms H⁺ and Cl⁻ ions, but the original H-Cl bond was still covalent.
Covalent bonding occurs in most non-metallic elements and in compounds of non-metals, where atoms share pairs of electrons. This happens between atoms of the same non-metal element, such as O₂ or Cl₂, and between different non-metals in compounds, such as H₂O or CO₂.
Ionic bonding occurs in compounds formed from metals combined with non-metals, where electrons transfer from metal atoms to non-metal atoms. It is not between any two different elements: two non-metals together share electrons instead.
CaF₂ has ionic bonding, because Ca is a metal and F is a non-metal. Metals combined with non-metals give ionic bonding, with electrons transferred to form oppositely charged ions.
Identify whether the elements are metals or non-metals: metals combined with non-metals give ionic bonding, non-metals together give covalent bonding, and metals, pure or mixed as alloys, give metallic bonding. So CaF₂ is ionic, N₂ is covalent and steel is metallic.
Metals conduct electricity and heat well because of metallic bonding: metal atoms release electrons into a 'sea' of delocalised electrons that are free to move around. This happens in pure metals, like copper wire or iron nails, and in alloys such as steel or brass.
Steel has metallic bonding, because it is an alloy of iron and carbon that keeps metallic bonding throughout. Pure metals and alloys such as steel and brass are held together by a sea of delocalised electrons.
Two non-metals do not form ionic bonds; they share electrons in covalent bonds instead. Ionic bonding happens specifically between metals and non-metals, not between any two different elements.
To decide bonding type, classify the elements: a metal with a non-metal gives ionic bonding, non-metals together give covalent bonding, and metals, pure or mixed as alloys, give metallic bonding.
N₂ has covalent bonding, because it is made only of non-metal atoms, which share pairs of electrons. Covalent bonding happens in most non-metallic elements, like O₂ and Cl₂, and in compounds of non-metals like H₂O.