Answer:
The 2 valence electrons in each atom of calcium
Explanation:
The chemical reactivity of an element is mostly dependent on it valence electrons and the distance of its valence electrons from the atomic nucleus. The Electron configuration for Calcium is 2.8.8.2. This means that it can donate the two outer electrons to achieve stable electron configuration 2.8.8. And because the two valence electrons are three (3) orbitals away from the nucleus, Calcium is relatively more reactive than metals in the 2nd period of the periodic table.
Here, we are required to identify which characteristic of calcium is most closely related to its chemical reactivity.
Calcium with atomic number 20, and electronic configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² has 2 Valence electrons in its outermost shell and as such, is highly electropositive.
The electropositivity of Calcium is as a result of its ability to readily lose its 2 outermost electrons in a chemical reaction thereby forming ionic bonding with electronegative elements such as Chlorine, Cl2.
Ultimately, the 2 electrons valency of calcium is the characteristic which is most closely related to its chemical reactivity.
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