Arundhati’s Periodic crossword table

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Across
  1. 3. elements listed vertically
  2. 4. an atom found in group 1
  3. 8. elements on the right-hand side of the periodic table
  4. 9. where elements can be found
  5. 10. has an atomic number of 2
  6. 11. sum of protons and neutrons of an atom
  7. 13. creator of the periodic table framework in 1869
  8. 15. group of elements found in group 17
  9. 19. a substance made up of only one type of atom
  10. 20. elements found in groups 3-12 of the periodic table
  11. 21. number of protons in an atom
  12. 22. elements on the left-hand side of the periodic table
  13. 23. bonds formed by two or more shared atoms
  14. 24. electrons that can move between atoms easily
  15. 25. a positively charged ion
  16. 27. element in group 2, period 4
Down
  1. 1. subdivision of electron shells separated by electron orbitals
  2. 2. Gaseous elements found in group 18 of the periodic table
  3. 5. a negatively charged ion
  4. 6. diagram representing the arrangement of electron shells in an atom
  5. 7. elements listed horizontally
  6. 12. a small group of elements with properties that are a mix of metals and nonmetals
  7. 14. The outermost shell in an atom
  8. 16. Element with a mass number of 6.941 u
  9. 17. electrons arranged in each shell surrounding an atom
  10. 18. the use of individual atoms to create structures
  11. 26. Molecules formed by anions and cations