Periodic table

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Across
  1. 4. Symbol: Cl and it is a yellow gas at room temperature
  2. 5. US five cent coin is 75% copper and 25% nickel
  3. 6. Atomic number is at 10 and it is found in digital devices
  4. 7. Its symbol is Na and it is highly reactive
  5. 9. It makes up 1.28% of Earth's atmosphere
Down
  1. 1. Symbol: C and it is non-metallic
  2. 2. Its symbol is "Cu"
  3. 3. Atomic number is 22
  4. 4. Has 20 protons, neutrons and electrons
  5. 8. We breath it in and out everyday of our lives