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. cai b. ca₂i c. cai₂ d. cai₃

Explanation:

Step1: Determine calcium's charge

Calcium in group 2 has a +2 charge ($Ca^{2 +}$).

Step2: Determine iodine's charge

Iodine in group 17 has a -1 charge ($I^{-}$).

Step3: Balance charges

To form a neutral compound, we need 2 iodine ions for 1 calcium ion. So the formula is $CaI_{2}$.

Answer:

C. $CaI_{2}$