Ages 12–13
BrainteenAges 12–13ScienceWorksheet
Atoms, ions and isotopes (KS3 · Year 8)
This is a preview. Print it for the full page.
Print or play free — create account
No card needed.I already have an account
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.
Related sheets
Ages 12–13
Ages 12–13
Ages 13–14
Ages 13–14
Ages 15–16
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
- Say new words out loud and use each one in a sentence – hearing and using words is how they stick.
- Sort answers into “know it” and “still learning”, and revisit only the second pile next time.
- Encourage teens to set their own target (say 12 out of 15) and track it over a few attempts.
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