Question

what is the chemical formula for the ionic compound barium iodide? select the correct answer below: o bai o bri o bafe₂ o bai₂

Explanation:

Step1: Identify barium ion

Barium (Ba) is in Group 2 of the periodic table, so it forms a $Ba^{2 +}$ ion by losing 2 electrons.

Step2: Identify iodide ion

Iodine (I) is in Group 17. It gains 1 electron to form the $I^{-}$ ion.

Step3: Determine formula

To balance the charges in an ionic compound, we need 2 iodide ions ($I^{-}$) for every barium ion ($Ba^{2+}$). So the formula is $BaI_{2}$.

Answer:

D. $BaI_{2}$