Exercise 1 — IGCSE 0654 May/June 2025 Paper 22 Q14
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Correct answer: A
Cambridge IGCSE·Co-ordinated Sciences 0654·Chemistry
Metallic Bonding
Key knowledge — Chemical Bonding
Key facts & rules
- Ionic bonding: metal loses electrons (→ cation) + non-metal gains electrons (→ anion) → electrostatic attraction.
- Ionic compounds: high melting point, conduct electricity when dissolved or molten, form crystals.
- Covalent bonding: non-metals share pairs of electrons.
- Simple molecular: low melting/boiling point, do NOT conduct electricity (e.g. H₂O, CO₂, CH₄).
- Giant covalent: very high melting point, hard, do NOT conduct electricity (except graphite). E.g. diamond, SiO₂.
- Metallic bonding: lattice of positive ions surrounded by a 'sea' of delocalised electrons.
- Metals: conduct electricity/heat, malleable, ductile — because of delocalised electrons.
- Hydrogen bonds: strong intermolecular forces in water and between N−H/O−H groups.
- Van der Waals forces: weak, temporary dipole attractions — exist between ALL molecules.
IGCSE Chemistry — Metallic bonding
1 Cambridge IGCSE 0654 questions on metallic bonding, across all three components.
About metallic bonding on IGCSE 0654
Every Cambridge IGCSE Co-ordinated Sciences 0654 question on metallic bonding (Chemical bonding, Chemistry), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.
Multiple choice
Metallic bonding — Extended multiple choice questions1 total · Paper 2