a student is studying calcium, a highly reactive element that humans need for strong bones. which characteristic of calcium is mostly related to its chemical reactivity?

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

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