Across
- 3. smaller than Alpha but can be stopped
- 4. A table with all the elements in order
- 10. how long it takes for an atom to decay half
- 13. smallest form of radiation
- 14. A meatal that is used very commonly used
- 15. 70% of the earths atmosphere
Down
- 1. The biggest form of radiation
- 2. A meatal that is seen to have large amount of value
- 5. have a full outer shell of elections
- 6. have two valence electrons
- 7. makes up all life
- 8. The process performed in nuclear power plants
- 9. have one valence electron
- 11. The sun performs this every second
- 12. we breath this and need to survive