Across
- 2. 5 What we exhale
- 5. 3 What your bones are made of
- 7. 8 Symbol is H on the periodic table
- 8. 2 The most reactive non-metal
Down
- 1. 6 Symbol is Na on the periodic table
- 3. 4 Symbol is K on the periodic table
- 4. 7 The most important chemical element on Earth
- 6. 1 The smallest unit of an element