[orgo814]

A question is asking me which group 17/VIIA element is the +7 oxidation state least stable. I know that with the p-block elements it is most stable in the 3rd period and least stable at top and bottom (2nd and 6th period). But it's asking me what element (not elements) is least stable so I have to assume its one. I know that with group 6 and 7 the fourth period element is rather unstable but is this less stable than the second and third? Would bromine be the least stable?

[UG]

How many atoms would 'fit' around the central atom in order for it to have a +7 oxidation state?

[orgo814]

Depends on the coordination number

[UG]

For example, think or find some compounds with bromine or iodine in the +7 oxidation state, what sort of compounds do you have? Is it possible for fluorine or chlorine to exhibit similar kinds of chemistry?

[orgo814]

I think the book just wants me to know the trends though. Like would it be period 2 or 6 being most unstable or period 4 since it was stated that this period is also pretty unstable (bromine). There has to be one which is the least stable in this +7 ox state

[UG]

Since fluorine can't have any positive oxidation states, personally I'd go with chlorine because of its small size.

[orgo814]

No you picked the most stable. Period 3 is always most stable in respect to oxidation-reduction chemistry and standard reduction potential

[UG]

Ok perhaps my reasoning is shoddy, we'll see if anyone else has an opinion