Periodic trends crossword extravaganza

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Across
  1. 3. the name of Mr Clark's lovable and all round great guy of a retriever
  2. 4. down a group, the electronegativity and ionisation energy
  3. 6. the number of electrons an s subshell can hold
  4. 10. the number of electrons a d subshell can hold
  5. 13. the energy required to remove one electron from each of a mole of atoms in the gas state
  6. 15. across a period the nuclear charge.....
  7. 17. science is not a
  8. 18. the distance from the centre of an atom to its valence electrons
  9. 19. a fancy way to say electron shells
Down
  1. 1. across a period, the electronegativity and ionisation energy
  2. 2. in order for an ion to be coloured it needs to have an _________ d subshell
  3. 5. a measure of the attraction an atom's nucleus has for a bonded pair of electrons
  4. 7. the word used to describe the repulsion caused by inner electron shells
  5. 8. down a group the attraction between the nucleus and outer electrons
  6. 9. the rows of the periodic table
  7. 11. a term to describe the number of protons in a nucleus
  8. 12. the distance from the centre of an ion to its outermost electrons
  9. 14. the groups of the periodic table
  10. 16. the number of electrons a p subshell can hold