[nerdingout]

How would you determine the size of a polyatomic ion?

For example when determining which ion is bigger, NH2- or I-, what would you use to determine the size difference?

I know that I- would be much smaller than I2- (since the e- are not held as tightly in the I2- causing the replusion to increase)

But what basis do we use to determine size of a nonelemental atom like the polyatomic ion or a a more complex molecule for that matter?

Thanks so so so much for reading!!!!!

[Vidya]

why you want to compare the sizes???
We can compare acidic or basic strengths like NH2- is stronger base than I-.This is understood by comparing their conjugate acids strengths as NH3 is weaker acid than HI

[Rana said]

For example when determining which ion is bigger, NH2- or I-, what would you use to determine the size difference?

I know that I- would be much smaller than I2- (since the e- are not held as tightly in the I2- causing the replusion to increase)

But what basis do we use to determine size of a nonelemental atom like the polyatomic ion or a a more complex molecule for that matter?

Thanks so so so much for reading!!!!!