Modern Periodic Table

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Across
  1. 5. Predictable increase or decrease across the table
  2. 6. Vertical column with similar valence electrons
  3. 7. 5f series element such as uranium
  4. 9. Highly reactive s-block metal in Group 1
  5. 10. Stair-step element like silicon or boron
  6. 12. Chemically inert family in Group 18
  7. 13. Positive or negative charged atom formed by electron transfer
  8. 15. Size of an atom from nucleus to outermost electron
  9. 16. Horizontal row in the modern table
  10. 17. Member of the 4f series rare-earth magnets
  11. 19. Scientist who used X-ray spectra to order elements by atomic number
  12. 20. Properties repeat in order of atomic number
Down
  1. 1. Tendency to attract bonding electrons
  2. 2. Family containing Cl and F
  3. 3. Point used as reference in electron shells (just for an easy short word)
  4. 4. True ID badge of an element (Z)
  5. 8. Number of electrons gained lost or shared
  6. 11. d-block element that often forms coloured ions
  7. 14. Chemist who predicted gallium and germanium
  8. 18. Zone defined by the last subshell being filled (s-, p-, d-, f-)