periodic table

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Across
  1. 2. metals
  2. 7. – a scientific law that states that during a chemical reaction, matter cannot be created or destroyed
  3. 12. a stable subatomic particle with a charge of negative electricity,
  4. 14. – an atom that has gained or lost one or more electrons.
  5. 16. -the smallest unit of an element
  6. 17. Symbol –letters that represents the name of the element.
  7. 18. symbol Cs
  8. 20. – located in the outermost energy level of an atom
Down
  1. 1. symbol Lr
  2. 3. stable a stable particle with a positive charge
  3. 4. a vertical column
  4. 5. – an element that has some properties of a metal
  5. 6. symbol C
  6. 8. bomb
  7. 9. – a substance that cannot be broken down
  8. 10. the midel of an atom
  9. 11. symbol Fr
  10. 13. is a subatomic particle
  11. 15. – the smallest unit of a compound
  12. 19. a horizontal row