Y10 Periodic table practice

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Across
  1. 2. Period 1, Group 18
  2. 4. Symbol "H"
  3. 5. Period 3, Group 16
  4. 7. Found between elements with a mass of 14 and 19
  5. 9. Period 4, Group 1
  6. 11. 2 energy levels, 2 valence electrons
  7. 14. Period 2, Group 18
  8. 17. Period 3, Group 2
  9. 18. Period 4, Group 2
  10. 19. Atomic number is 15
Down
  1. 1. The first gas at room temperature in period 2
  2. 3. 3 energy levels, Group 17
  3. 6. Non metal in period 2, is missing 1 electron
  4. 8. 6 protons, 6 Neutrons
  5. 10. Mass number 27
  6. 11. Period 2, Group 13
  7. 12. Period 2, Group 1
  8. 13. A noble gas in period 3
  9. 15. Has 14 protons and 14 neutrons
  10. 16. Mass number 23