ATOMS

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Across
  1. 1. _______ Horizontal rows in the periodic table
  2. 4. ____________ Number of protons in an atom
  3. 5. ________ Regions where electrons are likely to be found
  4. 8. _________ Model showing electrons in fixed orbits
  5. 10. ______ Neutral particle in the nucleus
  6. 12. _______________ Process of forming new elements in stars
  7. 15. ______ Number of electrons lost or gained
  8. 16. ____ SI unit for amount of substance
  9. 17. _____________ Region where electrons are found
  10. 20. ________ Most reactive nonmetals
  11. 21. ____ The smallest unit of matter
  12. 22. _______ Proposed the plum pudding model
  13. 24. _____ Positively charged particle
  14. 25. ____ Charged particles
  15. 26. __________ Sum of protons and neutrons
  16. 27. __________ Said matter is made of tiny indivisible particles
  17. 28. ____________ Elements in Group 1
  18. 29. __________ Elements in Group 18
Down
  1. 2. ________ How easily an element reacts
  2. 3. ______ Vertical columns in the periodic table
  3. 6. ________ Atoms of the same element with different masses
  4. 7. _____________ Chart that organizes all elements
  5. 9. __________ Discovered the nucleus
  6. 11. ______ Center of the atom
  7. 12. _________ Brittle elements that do not conduct electricity
  8. 13. ________ Negatively charged particle
  9. 14. ________ Particles inside the nucleus
  10. 18. ____ Developed the planetary model
  11. 19. _______________ Energy needed to remove an electron
  12. 23. ______ Shiny elements that conduct heat and electricity