13.1

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Across
  1. 3. These are the particles in the nucleus that have a neutral charge.
  2. 5. Positive electrical charge connects with/flows into a _________ charge.
  3. 7. Atoms that have unstable nuclei are _________.
  4. 10. The force holding the nucleus together is called the __________ force.
  5. 13. The term for the number of protons in an atom.
  6. 15. One or two letters symbolizing one of the elements on the periodic table.
  7. 17. Atoms of the same element that have different numbers of neutrons.
  8. 18. This is the large chart of all the elements.
Down
  1. 1. The center of the atom containing most of its mass.
  2. 2. Electrons are bound to the nucleus by an ___________ force.
  3. 4. When matter has a zero charge it is ________
  4. 6. Negative particles that are even smaller than atoms.
  5. 8. All matter has a fundamental property called ________
  6. 9. The part of the nucleus that has a positive charge.
  7. 11. Atoms of different elements have different ________ of protons.
  8. 12. __________ atoms have a nucleus that stays together.
  9. 14. There are 118 of these on the periodic table, and they make up all the matter in the world.
  10. 16. The term for the amount of protons and neutrons in an atom.