Chemistry Crossword (The website would only allow me to do 38 words, not 40)

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Across
  1. 6. - A cell that makes up things
  2. 7. - A property of metals, meaning it can transmit heat or electricity
  3. 10. - When a liquid is cooled and becomes a solid
  4. 14. - The number of electrons which can fill the second shell (number in letter form)
  5. 15. - A positively charged ion
  6. 17. - A halogen found in pools
  7. 18. - When a gas becomes a solid
  8. 21. - A negatively charged ion
  9. 22. - A negatively charged particle that is part of the nucleus of an atom
  10. 23. - A substance made up of only one type of atom
  11. 26. - A noble gas that makes your voice go high
  12. 28. - The vertical columns in the Periodic Table.
  13. 30. - An attribute of a metal being shiny
  14. 32. - An attribute of a metal being being able to be hammered into shape
  15. 34. - A neutral charged particle that is part of the nucleus of an atom
  16. 36. - The electric charge of a electron
  17. 37. - 2 or more different types of atoms chemically combined
Down
  1. 1. - The gas with the chemical formula H₂
  2. 2. - An attribute of a metal being being able to be drawn into wires
  3. 3. - The number of electrons which can fill the first shell (number in letter form)
  4. 4. - The smallest building block of matter
  5. 5. - The first name of the person who developed the first modern periodic table
  6. 8. - When a gas is cooled and becomes a liquid
  7. 9. - A positively charged particle that is part of the nucleus of an atom
  8. 11. - An element named after a famous person with the symbol Es
  9. 12. - The central part of an atom that comprises nearly all of the atomic mass and that consists of protons and neutrons
  10. 13. - The electric charge of a proton
  11. 14. - When a liquid is heated and becomes a gas
  12. 16. - The region of space around the nucleus in which electrons are found
  13. 19. - Charged particles that form when an atom or molecule loses or gains electrons
  14. 20. - The horizontal rows on the Periodic Table
  15. 24. - The number of electrons which can fill the third shell (number in letter form)
  16. 25. - What we breathe
  17. 27. - When a solid is heated and becomes a liquid
  18. 28. - State of matter with high energy where atoms are not bonded together
  19. 29. - When a solid becomes a gas
  20. 30. - State of matter with medium energy where atoms are loosely bonded
  21. 31. - The electric charge of a neutron
  22. 33. - 2 or more different non-metals chemically combined
  23. 35. - A state of matter with low energy where atoms are bonded tightly.