Across
- 1. (Clue: The most abundant gas in Earth's atmosphere.)
- 3. (Clue: A noble gas used in high-performance light bulbs.)
- 7. (Clue: A halogen essential for thyroid function.)
- 8. (Clue: A lightweight metal widely used in packaging and construction.)
Down
- 2. (Clue: A radioactive noble gas, often found in basements.)
- 4. (Clue: An element essential for DNA, with atomic number 15.)
- 5. (Clue: A noble gas, making up about 1% of Earth's atmosphere.)
- 6. (Clue: A transition metal used in LEDs and lasers.)