Periodic Table, Isotopes & Ions.

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Across
  1. 4. Carbon-12 and Carbon-14 are examples of ____.
  2. 8. The __ __ represents the weighted average of all the isotopes of an element.
  3. 9. The number of protons and neutrons in an atom gives its ____.
  4. 14. The mass number of an atom is the sum of its neutrons and ____.
  5. 15. The table that organizes elements by atomic number is the ____.
  6. 17. The atomic number of an element is equal to the number of ____.
  7. 18. The horizontal rows of the periodic table are called ____.
  8. 20. An Oxygen ion has a charge of -2, this type of ion is a ______.
  9. 21. ______ is an element part of the Halogen group.
Down
  1. 1. Group I is the periodic Table is call ____
  2. 2. Atoms of the same element with different numbers of neutrons are called ____.
  3. 3. The element with 46 protons is ______.
  4. 5. The element located in Group 6, Period 4 is ____.
  5. 6. Isotopes of the same element have different numbers of ____.
  6. 7. A column in the periodic table is also called a ____.
  7. 10. Neutrons have no _____.
  8. 11. The element with atomic number 17 is _______.
  9. 12. An example of a noble gas is ______.
  10. 13. Sodium has a charge of +1, this type of ion is call a _____.
  11. 16. The subatomic particle with a negative charge is the ____.
  12. 19. The first element in group 14 is _______.