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Recognising metallic giant structures from diagrams

Bonding, structure and the properties of matter • Chemical bonds

Key concepts

What you'll likely be quizzed about

  • A metallic giant structure consists of a three-dimensional lattice of positive metal ions.
  • Electrons from outer shells become delocalised, forming a mobile 'sea' that surrounds the ions.
  • This structure extends throughout the solid and lacks discrete molecules, resulting in a continuous network of ions and delocalised electrons.
  • Factors affecting behavior include the type of metal and the presence of alloys.
  • Alloys, made of different metal atoms, disrupt the regular lattice and alter properties, while small clusters or isolated atoms cannot form true giant structures.

Flashcards

Test your knowledge with interactive flashcards

How does ionic radius influence melting point in metals?

Click to reveal answer

Smaller metallic ions with higher electron density enhance attraction per ion, raising melting points; larger ions can decrease melting points.

Key notes

Important points to keep in mind

Metallic giant structures contain a lattice of positive ions and a delocalised electron sea.

Diagrams show identical ions in a repeating pattern; electrons are not bound to specific atoms.

Delocalised electrons cause electrical and thermal conductivity.

Non-directional metallic attraction allows layers to slide, producing malleability and ductility.

Strong multi-ion attraction and close packing raise melting and boiling points.

Alloying and impurities disrupt the lattice and change properties.

Increased temperature raises ion vibration, potentially reducing conductivity.

Absence of discrete molecules in a diagram indicates a giant structure.

Transition metals often exhibit stronger metallic bonding due to additional delocalised electrons.

Visual electron clouds or free-electron symbols are key diagrammatic indicators.

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