Question

Calcium (Ca) is in the second column of the periodic table and is classified as an alkaline earth metal. Which of the following formulas shows the ratio of a compound formed from calcium and iodine (I)? A.CaI3 B.Ca2I C.CaI2 D.CaI

Answer 1

C. CaI₂

Step-by-step explanation:

Calcium and iodine combine to form calcium iodide. The chemical formula for calcium iodide is CaI₂. Calcium (Ca) has a 2+ charge, and iodine (I) has a 1- charge. For the compound to be neutral, two iodine ions (each with a 1- charge) combine with one calcium ion (with a 2+ charge) to form CaI₂.