Chemistry Crossword

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Across
  1. 2. Chemical symbol Au
  2. 4. The ______ number is located above the element’s symbol
  3. 7. A substance made up of two or more types of atoms
  4. 8. The name of a horizontal line on the Periodic Table
  5. 9. A grid like structure made up of atoms
  6. 10. Is the 26th element of the periodic table
  7. 11. Has a chemical symbol of K
  8. 12. Ion with negative charge
  9. 14. The atomic mass is made up of the number of protons and ______
  10. 16. Name for electron shells
  11. 18. The second electron shell holds ______ electrons
  12. 19. Protons, neutrons and electrons are all ______ particles
  13. 21. An atom with positive or negative charge
  14. 23. Float around the nucleus in shells
  15. 25. The atomic number is the number of ______ in an atom's nucleus
  16. 26. Element with 9 protons
  17. 31. A group of atoms that are bonded together
  18. 32. The compound water is made up of 2 hydrogen atoms and 1 ______ atom
  19. 34. Has the chemical symbol Be
  20. 36. Sodium and ______ make up salt (NaCl).
  21. 38. The periodic table was developed by ______ Mendeleev
Down
  1. 1. The atom that becomes the ion, Cr3+
  2. 3. Has an electron configuration of 2,8,2
  3. 5. Another name for the outer shell of an atom
  4. 6. First element on the periodic table
  5. 11. Mendeleev was able to predict ______ of undiscovered atoms
  6. 13. Non-reactive atoms have a ______ outer shell
  7. 15. The name of a vertical line on the Periodic Table
  8. 17. Nitrogen has ______ electrons
  9. 19. Sulfur has ______ electrons in its outer shell
  10. 20. Ion with positive charge
  11. 22. Element with atomic number of 10
  12. 24. Has a chemical symbol of Ag
  13. 27. Ions are formed when an atom gains or ______ electrons
  14. 28. The inside part of an atom that houses subatomic particles
  15. 29. A substance made up of only one type of atom
  16. 30. Smallest building block of matter
  17. 33. The elements are arranged in ______ order
  18. 35. There are 118 elements on the ______ table
  19. 37. A group of atoms that have not been chemically bonded