Ages 12–13
BrainteenAges 12–13ScienceWorksheet
Atoms, ions and isotopes (KS3 · Year 8)
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Show your working and give units. Use the relative atomic masses (Ar) given in each question. Where an answer is not exact, round it to the number of significant figures or decimal places the question asks for.
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About this activity
What your child practises
Practising key skills with a ready-to-use activity.
What’s included
- 10 questions
- An answer key you can print with the sheet or on its own
- An on-screen version with instant marking and stars
Age and school year
Made for ages 12–13. That’s Grade 7–8 in the US, Year 8–9 in England, JSS 1–2 in Nigeria and Class 7–8 in India.
How to use it
- Print it at home or school – it fits a standard A4 or US Letter page.
- Print the answer key too, so marking takes seconds.
- Play it on screen: answers are marked instantly and children earn stars.
- Write on it on a tablet or touchscreen with a finger or stylus – no printer needed.
Tips for parents and teachers
- Do it on screen first for instant marking, then print it a few days later to see what was remembered.
- Little and often wins: five minutes a day beats one long session a week.
- Combine this sheet with past exam questions on the same topic for mixed, exam-style practice.
Good to know
- Time needed
- About 15–25 minutes
- You’ll need
- A printer (or a tablet to work on screen), a pencil and an eraser
- Difficulty
- Easier (KS3 · Year 8) – pitched at ages 12–13
- Answer key
- Yes – print it with the sheet or on its own