onic

123456789101112131415161718192021222324252627
Across
  1. 2. Horizontal rows in periodic table
  2. 4. Number of protons in an atom
  3. 6. Discovered the electron
  4. 7. Elements that do not easily react
  5. 11. Smallest unit of matter
  6. 12. Table organizing elements
  7. 15. Neutral particle in an atom
  8. 16. Center of the atom
  9. 17. Elements created artificially in labs
  10. 21. Atoms of the same element bonded together (ex: O₂)
  11. 22. Combination of two or more atoms
  12. 23. Vertical columns in periodic table
  13. 24. Organized elements by atomic number (scientist)
  14. 26. Energy level around nucleus
  15. 27. Particles orbiting nucleus
Down
  1. 1. Negatively charged particle
  2. 3. Process of creating new elements in stars
  3. 4. Negatively charged ion
  4. 5. Protons have this type of charge
  5. 8. Each element has a unique _ number
  6. 9. Particles found in the nucleus
  7. 10. Tiny solid sphere model scientist (last name)
  8. 13. Total protons + neutrons
  9. 14. Positively charged particle
  10. 18. Smallest particle of a compound
  11. 19. Scientist who proposed that electrons move in orbits
  12. 20. Atoms with different neutron numbers
  13. 25. Space where electrons are found