chemistry crossword

12345678910111213141516171819202122232425
Across
  1. 3. a element with the atomic number 'ZN'
  2. 4. group of atoms joined by covalent bonds
  3. 6. neutral particle in the nucleus in an atom
  4. 8. an element with the atomic symbol 'RN'
  5. 11. an element with the atomic symbol of 'H'
  6. 13. an element with the atomic symbol 'B'
  7. 14. the group in the periodic table between metals and non metals
  8. 16. positively charged particle in an atom
  9. 17. mass of one element calculated from the total number of protons
  10. 18. horizontal row of elements on periodic table
  11. 19. atom that has become electrically charged because it lost or gained electrons
  12. 20. the centre of an atom
  13. 22. pure substance that can not be broken down and made up of only one atom
  14. 24. makes up all living things that occupy space
  15. 25. an element with the atomic symbol 'AU'
Down
  1. 1. combination of pure substances
  2. 2. the most reactive non metals on the periodic table
  3. 5. negatively charged atom that goes around the nucleus
  4. 7. slow chemical change that occurs when oxygen reacts with metal
  5. 9. chemical reaction that absorbs energy
  6. 10. a table where all the elements are organized
  7. 12. chemical reaction where oxygen reacts with a substance to from new substance and give off energy
  8. 15. a material that electrical charge can pass through easily
  9. 17. the smallest part of an element that makes up all living things
  10. 21. a vertical column of elements on the periodic table
  11. 23. shiny, malleable, ductile elements that conduct electricity