Calcium forms which ion?

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Multiple Choice

Calcium forms which ion?

Explanation:
Calcium forms ions by losing its two outer electrons to reach a stable electron arrangement like a noble gas. The neutral atom has two valence electrons in the 4s orbital, so it most readily sheds them to become Ca2+. This +2 charge is the common and energetically favorable state for calcium in compounds such as CaCl2 or in body fluids as Ca2+. Gaining electrons to form a negative ion or removing more than two electrons would require breaking into a full inner shell or paying a much higher energy cost, which doesn’t happen under ordinary conditions.

Calcium forms ions by losing its two outer electrons to reach a stable electron arrangement like a noble gas. The neutral atom has two valence electrons in the 4s orbital, so it most readily sheds them to become Ca2+. This +2 charge is the common and energetically favorable state for calcium in compounds such as CaCl2 or in body fluids as Ca2+. Gaining electrons to form a negative ion or removing more than two electrons would require breaking into a full inner shell or paying a much higher energy cost, which doesn’t happen under ordinary conditions.

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