PERIODIC CLASSIFICATION OF ELEMENTS

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Across
  1. 3. I am noble gas with 2 electrons
  2. 9. I have mass no.1
  3. 10. I am a gas with 8 protons and 8 neutrons
  4. 11. I am non-metal with valency 3
  5. 12. I am metal with atomic no.13
  6. 13. I am 4 away from the noble gas,Argon with atomic
  7. 16. I have 15 as my atomic number
  8. 19. I have 2 electrons in first shell,8 in second she
Down
  1. 1. I have the 6th letter of alphabet as my symbol
  2. 2. I am element having valency 2
  3. 4. I am metal with symbol "Mg"
  4. 5. I am non-metal and present in liquid state at
  5. 6. I am a noble gas with valency 0
  6. 7. I am a noble gas with mass no.40
  7. 8. I am metal with valency 2
  8. 14. I am a non-metal with 6 neutrons
  9. 15. I am 3 away from noble gas Helium with mass no.11
  10. 16. I am a metal with symbol"K"
  11. 17. I am metal with atomic no.11
  12. 18. My atomic no.is sum of 1 and 2