Periodic table / Arsenic

Overview

Arsenic is a chemical element with symbol As and atomic number 33. Arsenic occurs in many minerals, usually in conjunction with sulfur and metals, and also as a pure elemental crystal. Arsenic is a metalloid.

Electron configuration

The electron configuration of Arsenic is [Ar] 3d10 4s2 4p3, with electron shells of 2, 8, 18, 5.

Physical and chemical properties

Arsenic is classified as a metalloid. It has an atomic mass of 74.922 and exists as a solid at standard conditions, appearing as metallic grey.

Real-world uses of Arsenic

Arsenic is valued for its semiconducting properties and is used in electronics, alloys, and specialty chemical applications.

Interesting facts about Arsenic

• Arsenic has the atomic number 33 and chemical symbol As.
• It belongs to period 4, group 15 of the periodic table.
• Arsenic was discovered by Bronze Age.

Explore Arsenic interactively

Want to compare Arsenic with other elements or see it highlighted on the full table? Open the interactive periodic table and click on As to explore properties, trends, and neighboring elements. You can also test your knowledge with our periodic table quiz game.