HSAB · Like Prefers Like
unseel.com · Pearson 1963 · hard-hard ionic, soft-soft covalent
Hg-S log K ~15
Pair —
Stage classification
Hard species (small, charged)
Soft species (diffuse, polarizable)
Favored pair (high log K)
Mismatched pair (weak)
Unseel.com · HSAB