Awesome science puzzle

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