Across
- 4. an element that smells like rotten egg.
- 6. a gas that makes up 78% of the Earth's atmosphere
- 7. an element with the atomic number of 81.
- 9. finish the sentence:" we use____ to test a leaf for starch."
- 10. an element that Marie Curie discovers that would also eventually kill her :(
Down
- 1. the only element that is named after a fictional planet.
- 2. an element with the chemical symbol of Sr.
- 3. the first element in the halogens group.
- 5. a gas that will make your voice go higher.
- 8. an element that help plants to grow faster.