Physics · GCSE · Atoms & Radioactivity
Nuclear equations
Nuclear equationsFree4:55Heddy Score 3 of 7, below the standard
What you need to know
- In alpha decay, the mass number decreases by four and the atomic number by two.
- In beta-minus decay, the atomic number increases by one while the mass number stays the same.
- Gamma emission changes neither mass number nor atomic number.
- Balance both the mass numbers and atomic numbers in a nuclear equation.
In this clip
Runs 4:55, from 0:00 to 4:55 of the full video.
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.3/7, Below the standard
See the seven stars
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
- Spec-true · not judged yet. Accurate, and right for the current UK specification.
- Focused · passed. One idea, short enough to watch in one go.
- Accessible · passed. Good captions, clear sound and pictures.
- Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
- Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
Our students
Not enough students yet
Our own students' answers. These are what move ★7 Proven.On YouTube
How the Heddy Score works559K views · 7.07K likes · Freesciencelessons 995K subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
The worked equations and practice examples make the decay rules concrete.
Freesciencelessons on YouTubechecked 2026-10-18
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