IB Chemistry SL 2.1 The Ionic Model

Practise following electron transfer from atoms to ions, balancing charges in formulas and recognising a giant ionic lattice from its physical properties. Explain ionic bonding…

Syllabus
First assessment 2025
Topic
2.1
Level
SL

Exam points

  • predict ion charges from electron configurations and balance them in an empirical formula
  • define ionic bonding as electrostatic attraction between oppositely charged ions
  • explain lattice properties through attraction strength and whether ions are free to move

Covered syllabus points

2.1.1—Ion formation2.1.2—Ionic bonding2.1.3—Ionic compounds

2.1 The ionic model question 1

[Maximum number: 1]

How many electrons will be gained or lost when the element with electron configuration 1s22s22p31 s^{2} 2 s^{2} 2 p^{3} forms an ionic bond?

A

Two electrons lost

B

Two electrons gained

C

Three electrons lost

D

Three electrons gained

2.1 The ionic model question 2

[Maximum number: 2]

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

Iron (II) sulfide, FeS , is ionically bonded.

Describe the bonding in this type of solid.

2.1 The ionic model question 3

[Maximum number: 3]

Periodic trends enable chemists to predict the behaviour of related compounds.

Na2O\quad \mathrm{Na}_{2} \mathrm{O} and SO3\mathrm{SO}_{3} are two oxides of period 3 elements.

Na2O\quad \mathrm{Na}_{2} \mathrm{O} does not conduct electricity in the solid state but it does when molten. Pure SO3\mathrm{SO}_{3} does not conduct electricity in either the solid or liquid states. Explain these facts.

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