As they have reported in Angewandte Chemie, it seems that the lead's "electron shield" is the main culprit. Lead does the most damage to the nervous system, kidneys, liver, brain, and blood.

Lead With A Poisonous Electron Shield: Free Pair Of Electrons May Be The Source Of Lead's Toxicity. ScienceDaily . Retrieved June 4, 2025 from www.sciencedaily.com / releases / 2007 / 01 ...