Science

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Across
  1. 3. Either positive negative or neutral
  2. 5. a row in the periodic table
  3. 7. ion composed of more than one atom
  4. 8. a collection of chemically connected atoms.
  5. 9. A bond including a non metal and a metal.
  6. 11. made of protons, neutrons and electrons, element
  7. 13. Negatively charged molecule
  8. 14. positively charged ion
  9. 15. collections of physically connected atoms.
  10. 18. a material which is lustrous and has loose electrons
  11. 19. the outermost shell in an atom
  12. 20. the structure where atoms reside connected
  13. 21. Neutral charged molecule in the nucleus
Down
  1. 1. electron that sits in the valence shell
  2. 2. a table that organises all the possible elements
  3. 4. a column in the periodic table
  4. 6. A bond including a non metal and a non metal.
  5. 7. Positively charged molecule in the nucleus
  6. 10. a material that has the opposite properties of metals
  7. 12. A bond with two metals
  8. 16. where the electrons orbit the nucleus
  9. 17. negatively charged ion