Science Crossword Puzzle

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Across
  1. 2. The process where atoms produce energy and particles
  2. 4. Elements that conduct electricity and heat
  3. 7. Positively charged particles
  4. 10. Metals that can be easily shaped
  5. 14. When an atom loses or gains an electron
  6. 15. The location of electrons
  7. 16. An ion that loses on or more electrons
  8. 17. Rare earth elements
  9. 20. Negatively charged particles
  10. 21. Uncharged particles
  11. 22. the number of protons in an atom's nucleus
  12. 23. The atomic mass unit of an element
  13. 24. Elements that cannot conduct electricity or heat
Down
  1. 1. Atoms of the same element that have different numbers of neutrons
  2. 3. Metals that are very reactive
  3. 4. Elements that have properties of both metals and nonmetals
  4. 5. Metals that are not very reactive
  5. 6. An ion that contains extra electrons
  6. 8. A process in which the number of protons change in an atom
  7. 9. The combination of protons and neutrons in the center of an atom
  8. 11. Gases that almost never react with other elements
  9. 12. Elements in vertical columns in the periodic table
  10. 13. Each horizontal row in the periodic table
  11. 18. Dense radioactive metals
  12. 19. Elements that are highly reactive and used to kill dangerous microorganisms