The Periodic Table

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Across
  1. 2. Particles in the nucleus that are electrically neutral
  2. 3. Organizes table horizontally
  3. 6. Particles in the nucleus with a positive charge
  4. 10. Smallest particle of an element that retains it's properties
  5. 12. Particles with a negative charge that are around the nucleus
  6. 15. Sum of of protons and neutrons
  7. 17. Elements chemically combined in a fixed proportion
  8. 18. Area around the nucleus of an atom where electrons are most likely to be found
  9. 19. Brittle, dull, and mostly gaseous elements
  10. 20. A positively charged atom
Down
  1. 1. Number of protons an atom has
  2. 4. When an atom has a charge
  3. 5. Shiny, conductors, malleable, ductile, and solid elements
  4. 7. Electrons travel in defined circular orbits around the nucleus
  5. 8. A substance made up of atoms that are alike
  6. 9. Organizes table vertically
  7. 11. Capital letter (with 1 or 2 lowercase)
  8. 13. Positively charged center of the atom
  9. 14. Atoms of the same element with different numbers of neutrons
  10. 16. electrons Electrons in the outermost orbital