<span>Kinetic molecular theory.
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33.6 moles are needed to completely react with 84.0 moles of O2
Answer:
protons are positive and neutrons are neutral, both are in nucleus
Explanation:
The reactivity of metals increases as you move left in a period and as you move down in a group, so Marie needs to know the period and group of the element inside each box. Boxes that show locations in groups 1 or 2 or in period 8 contain the most reactive elements.