Periodic Table DJW

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Across
  1. 5. Shows how electrons are arranged in their shells
  2. 9. Exists as single atoms
  3. 12. Bonding between non-metallic atoms
  4. 13. Metals that are in group 1
  5. 15. Core of an atom
  6. 16. The lightest of all the elements
  7. 17. Formed when electrons transfer from one atom to another
  8. 18. A special block of elements in groups 3–12
  9. 19. Number that tells you how many protons are in the nucleus
  10. 20. Small group of atoms bonded together
Down
  1. 1. Bonding based on an electron ‘sea’
  2. 2. Bonding that involves complete transfer of electrons
  3. 3. Group 18 gases
  4. 4. Non-metals that are in group 17
  5. 6. Elements that have the same proton number but different numbers of neutrons
  6. 7. Extended 3D structure
  7. 8. 118 of these are known to exist
  8. 10. Vertical columns in the periodic table
  9. 11. Horizontal rows in the periodic table
  10. 13. one of two special blocks of elements at the bottom of the periodic table
  11. 14. Different forms of the same element