C7. Changing Subatomic Particles Crossword

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Across
  1. 3. If an atom gains one or more electrons it will form a __________________ ion.
  2. 5. An _________________ is a heavier or lighter version of an element
  3. 8. These elements are found on the left side of the Periodic Table and usually form positive ions.
  4. 11. Atoms form ions so that their outer ring looks like the _________ gases.
  5. 12. Protons and __________________ are the subatomic particles that determine the mass of an atom.
  6. 13. Non-metals are found on the __________________ side of the Periodic Table and usually form negative ions.
  7. 14. An atom is a single particle of an ______________
  8. 18. Positive ions are called _______________.
  9. 20. All atoms are___________ because they have an equal number of protons and electrons.
Down
  1. 1. When an oxygen atom becomes an ion its name will change to ___________.
  2. 2. The isotope Cl-37 is ______________ than Cl-35 when we compare their mass.
  3. 4. Negative ions are called _______________.
  4. 6. We can form an ion by changing the number of _____________________ in an atom
  5. 7. If we change the number of protons in the nucleus of an atom we will get a ___________________ element.
  6. 9. Elements with less than four valence electrons tend to ___________ their valence electrons and form positive ions.
  7. 10. Ions have a ___________ and are not neutral.
  8. 15. Isotope notation includes the chemical symbol and atomic _________ of the isotope
  9. 16. The isotope K-39 has _________________ neutrons.
  10. 17. Elements in the periodic table are arranged by how many __________ they have.
  11. 19. An atom of lithium has __________ protons.