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Arsenic (As)
Element with atomic number 33, category: Metalloid, a solid at room temperature.
Element 33 of 118
Metalloid
Arsenic
Group 15, Period 4
Common Uses
Semiconductors, pesticides (toxic)
Electron Diagram
About Arsenic
Arsenic is a chemical element with the symbol As and atomic number 33, meaning every atom has 33 protons in its nucleus. It is classed as Metalloid and is a solid at room temperature. Its atomic mass is about 74.922 atomic mass units (u).
On the periodic table, Arsenic sits in group 15, period 4, which determines how many electron shells it has and how it tends to react with other elements.
Uses of Arsenic
In daily life and industry, Arsenic is used for Semiconductors, pesticides (toxic). These uses are closely tied to the typical properties of elements in the Metalloid category.
Electron Structure of Arsenic
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), Arsenic has 4 electron shells, with an approximate arrangement of 2, 8, 18, 5 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.