The Periodic Table Challenge Crossword Puzzle

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Across
  1. 4. What is the number assigned to an element based on the number of protons in the nucleas called
  2. 5. I am an element on the periodic table, my element symbol is Cl, and my atomic number is 17
  3. 7. What is a fundamental substance that cannot be broken into simpler substances by chemical or physical processess called
  4. 8. What is the characteristics of a substance that can be observed without changing it chemically, such as size, shape, density, and phase called
  5. 12. What is the smallest part of an element called
  6. 13. I am an element on the periodic table, my element symbol is H, and my atomic number is 1
  7. 14. What is a form of matter that is different from everyday matter called
  8. 15. What is the decreasing of volume called
  9. 16. What is the temperature at which the substance changes from a solid to a liquid called
  10. 18. I am an element on the periodic table, my element symbol is Na, and my atomic number is 11
Down
  1. 1. What is the reducing of volume as a result of applied pressure called
  2. 2. What is the temperature at which a liquid freezes called
  3. 3. I am energy in motion What am is my name
  4. 6. What is the smallest piece of a substance called
  5. 8. What is the easy to remember commonly used, and seen in everyday world called
  6. 9. What is something that takes up space called
  7. 10. I Display fundamental substances called elements what am I called
  8. 11. What is the increasing of volume called
  9. 14. What is a phase of matter that has definite shape and volume called
  10. 17. What is a phase of matter that has no definite shape or volume called