Awesome science puzzle

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