Chemistry crossword...

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Across
  1. 1. separates the metals from the non-metals
  2. 2. atom that has different number of protons/electrons
  3. 4. elements with properties of metals and non-metals
  4. 5. fluorine, chlorine, bromine, iodine and astatine.
  5. 6. refers to a horizontal row in the periodic table
  6. 8. an element that does not display the properties of a metal
  7. 9. weight of an atom
  8. 11. high electrical conductivity readily loses electrons to form +ions
  9. 12. a negatively charged ion
  10. 13. located on the outermost shell of a atom
  11. 14. a column of elements in the periodic table
Down
  1. 1. a standard way of writing large and small numbers\
  2. 3. helium, neon, argon etc.
  3. 7. number of protons in the nucleus
  4. 10. 6.02x10^23