Answer:
Rb
Step-by-step explanation:
Mg has 2 valence electrons to loose vs Rb has 1 valence electron to loose.
Rb wins because losing 1 electron is easier than having to lose 2, which means Rb is more reactive ("ready" to react).
Answer: Rb is more reactive
Explanation: The reason rubidium is more reactive is because it loses its valence electron more readily than Mg does.
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