Periodic Table

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Across
  1. 3. Has 76 protons
  2. 6. Chemical formula is H20
  3. 7. Has 2 naturally occurring isotopes
  4. 9. Vertical row of elements
  5. 10. The positively charged center of the atom
  6. 12. The___number is the sum of the protons and neutrons
  7. 14. Nonmetal, lightest and Simplest element
  8. 15. Also known as NaCI
  9. 16. Has 108 protons
  10. 19. Used as a disinfectant
  11. 20. Symbol is O
Down
  1. 1. The ____ number determines the type of element
  2. 2. Atoms of the same element,different#of neutrons
  3. 4. Used for machinery and tools
  4. 5. Electron __ is an area around the nucleus of an atom where electrons are most likely to be found
  5. 8. Has an atomic number of 35
  6. 11. Used in batteries
  7. 13. It's symbol is K
  8. 17. Particles in the nucleus with a positive charge
  9. 18. Horizontal row of elements