PERIODIC CLASSIFICATION OF ELEMENTS

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