Year 10 Crossword 1

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Across
  1. 1. particle of an atom with a mass of +1
  2. 4. the first noble gas in the periodic table
  3. 5. Fluorine and chlorine are part of this group of elements
  4. 8. the number of element in the outer shell of a noble gas
Down
  1. 1. the resulting charge of an atom after oxidation
  2. 2. the atomic ------ is equal to the number of protons in an atom
  3. 3. a negatively charge particle of an atom
  4. 6. the centre area of an atom
  5. 7. all elements are made of these
  6. 9. the vertical columns of a periodic table