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Promethium (Pm)
Element with atomic number 61, category: Lanthanide, a solid at room temperature.
Element 61 of 118
Lanthanide
Promethium
Group 7, Period 6 (lanthanide series)
Common Uses
Nuclear batteries
Electron Diagram
About Promethium
Promethium is a chemical element with the symbol Pm and atomic number 61, meaning every atom has 61 protons in its nucleus. It is classed as Lanthanide and is a solid at room temperature. Its atomic mass is about 145 atomic mass units (u).
On the periodic table, Promethium sits in group 7, period 6 (lanthanide series), which determines how many electron shells it has and how it tends to react with other elements.
Uses of Promethium
In daily life and industry, Promethium is used for Nuclear batteries. These uses are closely tied to the typical properties of elements in the Lanthanide category.
Electron Structure of Promethium
Using a simplified electron shell model (at most 2 electrons in the first shell, 8 in the second, 18 in the third, and so on), Promethium has 5 electron shells, with an approximate arrangement of 2, 8, 18, 32, 1 electrons from the innermost shell to the outermost. This is a simplified learning model, not the full electron configuration that accounts for the s, p, d and f subshells.
Explore Other Elements
Want to see another element or try the element symbol quiz? Go back to the Interactive Periodic Table to explore all 118 chemical elements.