The values of ΔGf° for the hydrogen halides become less negative with increasing atomic number. The ΔGf° of HI is slightly positive. However, the trend in ΔSf° is to become more positive with increasing atomic number. Explain.

Video transcript

Hello everyone. So in this video we're trying to explain why our delta G of hydrogen highlights becomes less negative with increasing atomic numbers despite the trend of delta S. So we know that as the atomic number increases that are he lied, radius also increases. And what this means is that delaying of the bonds increases which actually decreases the bond strength? Or does it not put an arrow? Just say then bond strength decreases. And with this being said then this results in a less spontaneous formation and that reflects as a less negative delta G. Alright so formally then with all this being said is that the bond length increases as the atomic number of the hay light increases? Alright. And this is actually going to be my final answer for this problem. All right. Thank you all so much for watching.