Periodic Table cross word puzzle

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Across
  1. 2. The element in Group 1 and Period 4
  2. 5. The second of the two additional rows often shown below the main table.
  3. 6. metals The group containing lithium, sodium, and potassium is called the ______.
  4. 7. The only liquid metal at room temperature.
  5. 10. The elements arranged by proton number and properties create repeating ______.
  6. 12. table The table that lists all known elements in order of increasing atomic number.
  7. 14. Vertical columns in the periodic table are called ______.
  8. 17. The first of the two additional rows often shown below the main table.
  9. 18. gases The group containing helium and neon is called the ______ gases.
  10. 20. elements The elements found in the center of the periodic table are called ______.
  11. 24. Elements that are gases at room temperature include oxygen and ______.
  12. 25. A period 4 metalloid
  13. 26. An element that exists as a diatomic molecule and is a solid nonmetal.
  14. 27. Elements in the same group have similar chemical ______.
  15. 28. The element in Group 14 and Period 2
  16. 31. A substance made up of only one type of atom.
  17. 32. number The number of protons in an atom (also called proton number).
  18. 33. There are a total of ___ groups in the periodic table.
  19. 34. The group containing fluorine and chlorine is called the ______ group.
Down
  1. 1. There are ___ periods in the periodic table.
  2. 3. Group 2 is also know as _______ earth metals
  3. 4. Elements that have properties between metals and non-metals are called ______.
  4. 8. numer of gases in periodic table
  5. 9. The arrangement of electrons in shells is called electronic
  6. 10. Horizontal rows in the periodic table are called ______.
  7. 11. Number of metals in periodic table
  8. 13. salt formers
  9. 15. The table is arranged by increasing ______ number.
  10. 16. The element in Group 2 and Period 3
  11. 19. Any characteristic that describes an element is called a
  12. 21. The right-side elements of the periodic table (except hydrogen) are mostly ______.
  13. 22. Elements such as H₂, N₂, O₂, and Cl₂ exist naturally as ______ molecules.
  14. 23. The elements on the left and center of the periodic table are mostly ______.
  15. 29. Numer of Diatomic elements in Periodic table
  16. 30. The only liquid nonmetal at room temperature.
  17. 35. The smallest unit of an element that retains its properties.