The Student Room Group

Question on ionic radius and the effect on Hydration enthalpy?

How do you know an ion is bigger / smaller than another ion?
For example, F- and Cl-?
Reply 1
Depending on the period and group it’s in on the periodic table?
Reply 2
Original post by Deggs_14
Depending on the period and group it’s in on the periodic table?

So, they are both in group 7 , but chlorine is in period 3 and fluorine period 2? So how would I use that to determine which is smaller or bigger and why??
Original post by Sidd1
So, they are both in group 7 , but chlorine is in period 3 and fluorine period 2? So how would I use that to determine which is smaller or bigger and why??

Chlorine has an additional shell of electrons compared to fluorine so is bigger.
Reply 4
Original post by harleyh4
Chlorine has an additional shell of electrons compared to fluorine so is bigger.

Oh okay so you have to look at the ionic radius which for chlorine is bigger so it is bigger compared to fluorine? is that all?
Reply 5
Is the formation of O3 from O2 a increase/ decrease in entropy and why??
Original post by Sidd1
Is the formation of O3 from O2 a increase/ decrease in entropy and why??


Decrease, as fewer moles of gas are formed.

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