Final answer:
Calcium is more reactive than magnesium due to differences in their atomic properties, specifically in terms of ionization energy and size.
Explanation:
Calcium is more reactive than magnesium despite being in the same periodic group 2 due to differences in their atomic properties. Both elements are alkaline earth metals with high reactivity, but calcium has a higher first ionization energy compared to magnesium, making it more reactive. Even though both elements lose two valence electrons, the smaller size and higher ionization energy of calcium contribute to its increased reactivity.
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