Edexcel IAL Chemistry 3.20 Metallic lattice model

Identify the metal's ion charge, arrange cations in a regular lattice and place mobile electrons between them before labelling the electrostatic model.

Exam points

Draw a labelled metallic lattice with positive metal ions and delocalised electrons.
Identify a metal as a giant metallic structure rather than an ionic or molecular solid.

[Maximum number: 3]

This question is about the bonding in the elements of Period 3 in the Periodic Table. The melting temperatures of the Period 3 elements are shown in the table.

Table for Question 3.22—The models in 3.20 and 3.21 to interpret simple properties of metals question 1 — Edexcel A-Level Chemistry AS

Sodium, magnesium and aluminium are metals.

Melting temperature depends on the strength of metallic bonding.

Explain why the metallic bonding in magnesium is much stronger than that in sodium.

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3.22—The models in 3.20 and 3.21 to interpret simple properties of metals question 1