Chemistry A-Level
90° and 180° arrangements
What 90° and 180° arrangements means in Chemistry A-Level, as defined for AQA.
Definition of 90° and 180° arrangements
Check what you remember
Read the wording for your board, then hide it and explain 90° and 180° arrangements in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The bond angle between two ligands in the cis arrangement is 90°, and between two ligands in the trans arrangement is 180°.
Topics that use 90° and 180° arrangements
- Shapes of complex ions (A-level only) (AQA A-Level)
Related terms
- cis-trans isomerism
- inactive trans isomer
- ligand size
- ligand substitution with DNA
- risks and benefits
- stereoisomerism
- bond angle of 109.5°
- cisplatin structure
Using 90° and 180° arrangements in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Chemistry questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Chemistry A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge