your secret santa

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