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Indium (In)
Element with atomic number 49, category: Post-transition metal, a solid at room temperature.
Element 49 of 118
Post-transition metal
Indium
Group 13, Period 5
Common Uses
Touchscreens
Electron Diagram
About Indium
Indium is a chemical element with the symbol In and atomic number 49, meaning every atom has 49 protons in its nucleus. It is classed as Post-transition metal and is a solid at room temperature. Its atomic mass is about 114.818 atomic mass units (u).
On the periodic table, Indium sits in group 13, period 5, which determines how many electron shells it has and how it tends to react with other elements.
Uses of Indium
In daily life and industry, Indium is used for Touchscreens. These uses are closely tied to the typical properties of elements in the Post-transition metal category.
Electron Structure of Indium
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), Indium has 4 electron shells, with an approximate arrangement of 2, 8, 18, 21 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.