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Antimony (Sb)
Element with atomic number 51, category: Metalloid, a solid at room temperature.
Element 51 of 118
Metalloid
Antimony
Group 15, Period 5
Common Uses
Flame retardants
Electron Diagram
About Antimony
Antimony is a chemical element with the symbol Sb and atomic number 51, meaning every atom has 51 protons in its nucleus. It is classed as Metalloid and is a solid at room temperature. Its atomic mass is about 121.760 atomic mass units (u).
On the periodic table, Antimony sits in group 15, period 5, which determines how many electron shells it has and how it tends to react with other elements.
Uses of Antimony
In daily life and industry, Antimony is used for Flame retardants. These uses are closely tied to the typical properties of elements in the Metalloid category.
Electron Structure of Antimony
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), Antimony has 4 electron shells, with an approximate arrangement of 2, 8, 18, 23 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.