A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?
The 20 protons in each atom of calcium
The density of calcium, which is 1.54 g/cm3
The atomic mass of calcium, which is 40.078 amu
The 2 valence electrons in each atom of calcium

The 2 valence electrons in each atom of calcium this is a characteristic of calcium are most closely related to its chemical reactivity. Hence, option D is correct.

What is calcium?

Calcium is a chemical element with the symbol of (Ca).an atomic number of calcium is 20.it is an alkaline earth metal. The atomic mass of calcium is 40.078 unit.

When metal atoms are reacts by losing they're losing their valence electrons. So, the reactivity of a metal depends on how easily its atoms lose valence electrons.

Calcium is a major mineral in our bones.

If you don’t get the right amount of calcium, you lose more bone strength.

The chemical reactivity of an element is dependent on its valence electrons and the distance of its valence electrons from the atomic nucleus.

The 2 valence electrons in each atom of calcium this is a characteristic of calcium is most closely related to its chemical reactivity. Hence, option D is correct.

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