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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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Answer:

4. Sodium is highly reactive.

5. Helium is consider an unreactive element because it is an inert gas.

6. The electrons in the partly filled outermost shell.

7. The order of most reactive from least reactive is Ar, S, Ca, C

8. (Na & Mg) have the same chemical properties.

9. Potassium has the fewest valence electrons.

Explanation:

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