Question
Why are elements at the extreme left and extreme right the most reactive?
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$\Delta\text{H}^\circ=91\text{kJ mol}^{-1}$ at 298K, S°(HgO) = 72.0J K-1 mol-1, S°(Hg) = 77.4J K-1 mol-1 and $\text{S}^\circ_{(\text{O}_2)}=205\text{J K}^{-1}\text{mol}^{-1}$ at 298K.
| Isotope | Isotopic molar mass | Abundance |
| 36Ar | 35.96755g mol–1 | 0.337% |
| 38Ar | 37.96272g mol–1 | 0.063% |
| 40Ar | 39.9624g mol–1 | 99.600% |