science extra credit marking period 3

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Across
  1. 4. located in the middle of atoms
  2. 5. has 41 protons
  3. 6. negative charge resides in this cloud
  4. 7. same element with different atomic mass
  5. 9. combination of protons neutrons and electrons to make matter
  6. 11. has 87 protons
  7. 12. charged atom or molecule
  8. 14. all matter is made of this
  9. 15. has 3 protons
  10. 16. positive charge resides in the nucleus
  11. 18. has 42 protons
  12. 19. has 113 protons
  13. 20. atoms are the building block of _______
Down
  1. 1. has 86 protons
  2. 2. list of every known and theoretical element
  3. 3. neutral charge resides in the nucleus
  4. 8. has 37 protons
  5. 10. has 22 protons
  6. 13. has 10 protons
  7. 17. has 94 protons