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Mercury Essay Preview: Mercury Report this essay Mercury Atomic Structure Atomic Mass: 200.59amu Atomic Number: 80 Protons: 80 Electrons: 80 Neutrons: 121 Electron Configuration: 1s2 2s2p6 3s2p6d10 4s2p6d10f14 5s2p6d10 6s2 Isotopes: Isotope Half Life Hg-194 520.0 years Hg-196 Stable Hg-197 2.7 days Hg-197m 23.8 hours Hg-198 Stable Hg-199 Stable Hg-200 Stable Hg-201 Stable Hg-202 Stable.