Across
- 5. bubbling/fizzing
- 6. H20
- 8. easily reshaped without breaking
- 9. number of valence electrons
- 10. when a reaction releases heat
- 14. atoms with the same element symbol but different number of nuetrons
- 16. negatively charged
- 17. Its chemical symbol : P
- 18. what we need to breathe
Down
- 1. outer shell
- 2. when a compound is heated and breaks down into 2 smaller products
- 3. Its chemical symbol : Be
- 4. have properties of metals
- 7. number of electron shells
- 11. what we need for strong teeth and bones
- 12. when a reaction takes in surrounding heat
- 13. have a full valence shell(does not need to share/gain/lose electrons)
- 15. positively charged