Quantum Number 2

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Across
  1. 2. The second most common element in the universe, but very rare on the Earth.
  2. 3. Lightest and most common element found in the universe.
  3. 8. [Ar] 3d¹⁰ 4s² 4p²
  4. 9. [He] 2s² 2p¹
  5. 10. It's atomic number is 28.
Down
  1. 1. [He] 2s²
  2. 4. [Ne] 3s² 3p⁴
  3. 5. The country Argentina is named after that element.
  4. 6. [Ne] 3s² 3p⁶
  5. 7. It's atomic mass is 65.