The Periodic Table

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