4. Which element is highly reactive: Sodium, Helium, or Chlorine?
5. Why is Helium considered an unreactive element?
6. What determines an element's' chemical property?
7. List these elements in order of most reactive to least reactive: Ca, C, S, and Ar.
8. Which elements have the same chemical properties: (Na & Mg), (Na & Ca), or (Na & K) ?
9. Which element has the fewest valence electrons: Iron, Fluorine, Potassium, or Neon?
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