[ritwik08]

Why does the stability of highest oxiation state decreases from group 13 to group 17?

Ans: My book says, that with the increase in atomic number, difference in energies between ns and np orbitals increases. Is it right? If so then can u please explain what relation exists between the statements.

[Mitch]

Electron negativity also increases from left-to-right. So, it wants to keep electrons, not give them away and be in high oxidation states, right?

[IITian]

I agree with Mitch, but it is slightly more complicated than that