My Chemistry Puzzle

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Across
  1. 1. the d-block elements with typical metallic properties and are often referred to as
  2. 4. a measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound
  3. 8. Ce
  4. 10. the elements of Group 17 of the periodic table
  5. 13. Fr
  6. 14. the horizontal columns of the periodic table
  7. 16. the elements of Group 2 of the periodic table
  8. 21. a negative ion
  9. 22. The energy change that occurs when an electron is required by a neutral atom
  10. 23. Lu
  11. 25. an atom or group of bonded atoms that has a positive or negative charge
  12. 26. the physical and chemical properties of the elements are periodic functions of their atomic numbers.
  13. 27. an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group.
  14. 29. the elements of Group 1 of the periodic table
  15. 30. developed a method that led to the determination of standard relative atomic masses
Down
  1. 2. Lr
  2. 3. p-block elements together with the s-block elements
  3. 5. element 6
  4. 6. the electrons available to be lost, gained or shared in the formation of chemical compounds
  5. 7. the vertical columns of the periodic table
  6. 9. element 30
  7. 11. Na
  8. 12. the 14 elements with atomic numbers from 58 (cerium, Ce) to 71 (lutetium, Lu).
  9. 15. element 7
  10. 17. the 14 elements with atomic numbers from 90(thorium, Th) to 103 (lawrencium, Lr).
  11. 18. the energy required to remove one electron from a neutral atom of an element
  12. 19. element 1
  13. 20. element 90
  14. 24. the elements of Group 18 of the periodic table
  15. 28. a positive ion