Stable and Unstable
Nuclei

Introduction

Stable and unstable nuclei build upon the ideas introduced in atomic structure and help explain why some atoms are radioactive. Understanding nuclear stability is essential for studying radioactivity, nuclear Physics and particle interactions later in the AQA A Level Physics course.

In this topic, students learn about isotopes, the forces acting within the nucleus, and the processes of alpha and beta-minus decay. Students also develop their understanding of how radioactive decay changes proton number and nucleon number, and how nuclear equations can be used to represent these changes.

AQA A Level Physics Specification: 3.2.1.2 Stable and Unstable Nuclei

What You Need to Know

Define isotopes.
Explain the difference between stable and unstable nuclei.
Describe alpha decay.
Describe beta-minus decay.
State how proton number and nucleon number change during radioactive decay.
Complete and balance nuclear equations.
Describe the strong nuclear force.
Calculate nuclear charge.
Define specific charge.
Calculate specific charge using charge and mass values.

Downloadable Topic Pack

Stable and Unstable Nuclei Past Exam Question & Answer Pack

Particle Interactions
Classification of Particles
Quarks and Antiquarks

Enquire Now

Testimonials

Success Stories

Gurpreet S

Claire T.

With Sarah's help my daughter managed to gain an A* in her Physics A Level exams (almost 100% on paper 2!) and was able to gain entry to UCL. We are so proud and cannot thank Sarah enough.

Sarah transformed my daughter's approach to Physics. Her examiner insight was invaluable for boosting her final GCSE grade from a 7 to a 9.

S. Ahmed

Professional and encouraging, Sarah's expert coaching helped my son gain admission to Cambridge to study Natural Sciences. Highly recommended.

James R.

The small group sessions are fantastic. They provided the targeted exam practice and confidence my twins needed to excel.

See more testimonials HERE