Euka Science Crossword

12345678910111213141516171819202122232425
Across
  1. 5. The way electrons are arranged in the shells
  2. 7. When a single compound breaks down into two simpler
  3. 13. Defines a materials
  4. 16. 1800 times smaller in mass than protons and neutrons
  5. 17. Opposite of acid,it likes to receive hydrogen ions
  6. 21. The weight of an atom
  7. 22. Have a positive charge
  8. 25. A row in the periodic table
Down
  1. 1. One that cannot be broken down into another substance
  2. 2. Proposed the photoelectric effect
  3. 3. Discovered the neutron
  4. 4. Table in which all known elements are represented
  5. 6. Russian chemist
  6. 8. An example of oxidation
  7. 9. of hydrogen. The scale in which acids and bases are measured
  8. 10. Smallest indivisible form a chemical particle
  9. 11. Liquid that produces positive charged hydrogen ions
  10. 12. Two or more substances combine
  11. 14. The burning of a substance in oxygen
  12. 15. Elements created by scientists
  13. 18. The number of protons in the nucleus
  14. 19. The measure of an atom’s ability to attract a pair of electrons
  15. 20. Not a element
  16. 23. A column in the periodic table
  17. 24. Have no electrical charge