Nat5 Unit 1 chem puzzle

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Across
  1. 2. number of atoms in a molecule of sulphur trioxide
  2. 6. the number that gives protons +neutrons in nucleus
  3. 9. the type of bond formed by sharing a pair of electrons
  4. 11. type of bonding found in carbon
  5. 12. a halogen
  6. 13. name of compound containing sodium,carbon and oxygen
  7. 14. this type of ion is formed by gaining electrons
  8. 16. an atom with same number of protons as another but different number of neutrons
  9. 17. nitrate
  10. 19. this type of bonding conduct when solid and when liquid
  11. 22. number of atoms in a molecule of dinitrogen tetroxide
Down
  1. 1. type of charge found on a potassium ion
  2. 3. gas that relights a glowing splint
  3. 4. mass of 0.5 moles of nitrogen gas
  4. 5. lightest atom in periodic table
  5. 7. this is the number of particles in the gram formula mass
  6. 8. mass of a proton in amu
  7. 9. this element can form coloured compounds
  8. 10. number of outer electrons in a oxide ion
  9. 13. an alkali metal
  10. 15. A column in the periodic table
  11. 18. type of bonding in lithium oxide
  12. 20. number of protons in a helium atom
  13. 21. particle formed by an atom gaining or losing electrons