Across
- 3. The rarest element in the universe
- 6. An essential element for human survival
- 7. Helps to transport oxygen from lungs to all parts of the body
- 8. This metal is the softest compared to other metals in the periodic table
- 9. The only metal in liquid state at room temperature
- 10. The most abundant element in the universe by mass
Down
- 1. The most radioactive element
- 2. This element is the first of the noble gases
- 4. The element with the highest boiling point
- 5. This gas makes up about 78% of the Earth's atmosphere