Chemistry review

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Across
  1. 3. a substance made out of at least two different elements
  2. 4. an ion with a positive charge
  3. 7. the total amount of protons and neutrons in an atom
  4. 9. common name for sodium chloride
  5. 12. a molecule with two atoms only
  6. 14. the type of bond made between non-metals
  7. 16. most elements are most stable when they have _________ electrons in their outer shell
  8. 17. name of fluorine ion
  9. 19. atoms with the same number of protons but different numbers of neutrons
Down
  1. 1. a ion with a negative charge
  2. 2. all of the elements that can form molecular elements which are diatomic
  3. 5. number of neutrons in Calcium-46
  4. 6. covalent bonds _________ electrons
  5. 8. type of diagram that shows protons, neutrons and electrons
  6. 10. a solid mixture of metals
  7. 11. number of bonds in a molecule of N2
  8. 13. element with atomic weight of 47.87
  9. 14. dioxide name of chemical CO2
  10. 15. number of valence electrons of iodine
  11. 18. ion name of lithium cation