Question

(◍•ᴗ•◍) hey guys can anyone tell me

why is there I2 in barium iodide and I3 in aluminum iodide while both have same element that Is iodide
please tell me difference and suitable explanation


dont copy paste from websites or internet​

Answer 1

Answer:

Because Barium here is in +2 oxidation state.

So when Ba and I exchange valency it forms BaI2.

While Aluminum exists in +3 oxidation state.

So that's why it forms AlI3.

Hope I was able to make you understand.

Lil-Zyush :-)

Answer 2

Answer:

When a compound is formed using 2 elements the valency of both the elements are interchanged

For ex

In barium iodide

Valency of Barium is 2 and Valency of Iodide is 1 so it is written as Ba1 I2 or Ba I2 (as writing 1 is not important).

In Aluminium Iodide

Valency of Aluminium is 3 and Valency of Iodide is 1 so it is written as Al1 I3 or Al I3 (reason same as above)

Therefore the value 2 or 3 does not depend on Iodide but it depends on the element with which it is forming a compound.