Lead

In nature, lead is found in the Earth's crust, ~20 ppm, in minerals such as galena (primary source of lead), anglesite, cerussite, mimetite and pyromorphite [7]. The isotopes found in nature are ²⁰⁴Pb (1.40 %, stable), ²⁰⁶Pb (25.2 %, stable), ²⁰⁷Pb (21.7 %, stable) and ²⁰⁸Pb (51.7 %, stable), [7].

In pure solid form, Lead exist in a face-centered cubic crystal structure [2].