Awesome science puzzle

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Across
  1. 5. something measured because it change
  2. 7. one type of atoms that is a pure substance
  3. 8. consist two atoms that is a molecule
  4. 10. electrons in a molecule that easily move between atoms
  5. 11. has the most protons
  6. 15. formed through covalent bonding
  7. 20. the outer shell
  8. 22. structure formed when manipulating individual atoms
  9. 25. molecule formed by positively charged and negatively charged cation
  10. 26. in periodic table it is vertical
  11. 29. show arrangement of electrons shell in atom
  12. 30. Found between groups 3 to 12 in periodic table
  13. 31. Ion that is negatively charge
Down
  1. 1. a tiny group of elements with properties that are a combination of metals and non-metals
  2. 2. found in group 18 that is a collection of gaseous
  3. 3. in periodic table it is horizontal
  4. 4. Formed by positively charged and negatively charge cation
  5. 6. the configuration of electrons in each of an atom's electron shells
  6. 9. List of elements in the periodic table's group 17
  7. 12. in periodic table found in group 1
  8. 13. when two or more atoms share electrons
  9. 14. Atom that has lost or gain electrons
  10. 16. small tube made by carful arrangement of carbon atoms
  11. 17. In the right side of the periodic table
  12. 18. found in left hand-side or periodic table
  13. 19. positively charge ion
  14. 21. the number of portons
  15. 23. transition metals with the least amount of protons
  16. 24. Group 2 of the periodic table
  17. 27. Charge ion that have two or more atoms bonded with eachother
  18. 28. elements arrange into a table according to chemical elements