IB Chemistry SL 2.3 The Metallic Model

Practise using a cation lattice and delocalised electrons to explain conductivity and malleability, then rank metallic bond strength from charge and radius.

Syllabus
First assessment 2025
Topic
2.3
Level
SL

Exam points

  • explain conductivity and malleability using mobile electrons and sliding cation layers
  • rank metallic-bond strength by cation charge, radius and available delocalised electrons

Covered syllabus points

2.3.1—Metallic bonding2.3.2—Bond strength

2.3 The metallic model question 1

[Maximum number: 1]

Iron may be extracted from iron (II) sulfide, FeS.

Outline why metals, like iron, can conduct electricity.

2.3 The metallic model question 2

[Maximum number: 1]

Which series shows the correct order of metallic bond strength from strongest to weakest?

A

Na>K>Rb>Mg

B

Mg>Rb>K>Na

C

Rb>K>Na>Mg

D

Mg>Na>K>Rb

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