Is Sulfur a Metal? (+ 3 Fascinating Facts to Know)

No, sulfur is not a metal. Sulfur is a nonmetal. ¹ It does not possess the typical characteristics of metals such as high electrical conductivity, malleability, and luster. Instead, sulfur is brittle, has low electrical conductivity, and exhibits nonmetallic properties such as being a poor conductor of heat and electricity.

Well, this was just a simple answer. But there are few more things to know about this topic which will make your concept super clear.

So let’s dive right into it.

Why is sulfur a nonmetal?

Sulfur is classified as a nonmetal due to its physical and chemical properties. Nonmetals generally have low melting and boiling points, are poor conductors of heat and electricity, and tend to form negative ions when they undergo chemical reactions. Sulfur exhibits these characteristics, which make it fall into the nonmetal category. ²

Physically, sulfur is a brittle, yellow solid at room temperature. It has a relatively low melting point of 115.21 degrees Celsius (239.38 degrees Fahrenheit) and a boiling point of 444.6 degrees Celsius (832.3 degrees Fahrenheit). ³ These low melting and boiling points are typical of nonmetals, as they lack the strong metallic bonds that hold together the atoms of metals, resulting in weaker intermolecular forces.

Chemically, sulfur tends to gain electrons when it reacts with other elements. It has six valence electrons in its outermost energy level, two electrons short of achieving a stable noble gas electron configuration. ⁴ By gaining two electrons, sulfur can achieve a stable configuration, similar to that of the noble gas argon. This tendency to gain electrons and form negative ions is a common characteristic of nonmetals.

Furthermore, sulfur is a poor conductor of heat and electricity. ⁵ Nonmetals generally do not possess the free electrons that are responsible for conducting heat and electricity in metals. Instead, the electrons in nonmetals are more tightly bound to their respective atoms, making it difficult for them to move and carry charge.

Overall, based on its physical properties, chemical behavior, and electrical conductivity, sulfur exhibits typical characteristics of a nonmetal. These properties differentiate it from metals, which have high melting and boiling points, are good conductors of heat and electricity, and tend to form positive ions in chemical reactions.

Nonmetallic properties that sulfur have

Here are some key nonmetallic properties exhibited by sulfur.

• Low melting and boiling points: Sulfur has a relatively low melting point of 115.21°C (239.38°F) and a boiling point of 444.6°C (832.3°F). This is typical of nonmetals, as they lack strong metallic bonds, resulting in weaker intermolecular forces that require less energy to break and transition between states.
• Brittle solid form: Sulfur exists as a brittle solid at room temperature. ⁶ Nonmetals tend to have structures with covalent or molecular bonding, which results in a lack of the extended metallic lattice found in metals. This molecular arrangement contributes to the brittleness observed in nonmetals like sulfur.
• Poor electrical conductivity: Sulfur is a poor conductor of electricity. Nonmetals lack the free electrons that allow for efficient electron flow. In sulfur, the tightly bound electrons are not readily available to move and carry an electric charge.
• Poor thermal conductivity: Sulfur exhibits low thermal conductivity. Nonmetals generally lack the delocalized electrons present in metals that are responsible for efficient heat transfer. As a result, sulfur cannot efficiently conduct and transfer heat.
• Tendency to gain electrons: Sulfur has six valence electrons in its outermost energy level and tends to gain electrons in chemical reactions. This characteristic is commonly observed in nonmetals, which strive to achieve a stable electron configuration similar to that of noble gases by acquiring additional electrons.
• Formation of negative ions: When sulfur reacts, it typically forms negative ions. By gaining electrons, sulfur can achieve a stable electronic configuration, which is another feature commonly associated with nonmetals.

These properties collectively classify sulfur as a nonmetal, as it exhibits characteristics that are distinct from those of metals.

Can sulfur form metallic bonds with other elements?

No, sulfur does not typically form metallic bonds with other elements. Metallic bonding occurs when metal atoms share their valence electrons in a “sea” of delocalized electrons, creating a lattice-like structure. This sharing of electrons allows metals to have high thermal and electrical conductivity, as well as malleability and ductility. ⁷

Sulfur, on the other hand, is a nonmetal and does not have the properties necessary for metallic bonding. Nonmetals tend to form covalent bonds, where atoms share electrons to achieve a stable electron configuration. ⁸

Sulfur commonly forms covalent bonds with other nonmetals or metalloids by sharing electrons. This results in the formation of molecules or compounds rather than the extended lattice structure characteristic of metallic bonding.

So, while sulfur can form chemical bonds with other elements, these bonds are typically covalent in nature rather than metallic.

How does sulfur differ from other nonmetals?

Sulfur exhibits some distinguishing characteristics that set it apart from other nonmetals. Here are a few ways in which sulfur differs from other nonmetal elements:

• Appearance: Sulfur is known for its distinct yellow color and often occurs in its elemental form as a bright yellow solid. ⁹ This sets it apart visually from many other nonmetals that have varying colors or may be colorless.
• Allotropes: Sulfur has several allotropes, meaning it can exist in different forms with different molecular structures. The most common allotrope is S8, where eight sulfur atoms are arranged in a ring-shaped structure. ¹⁰ This ability to form different molecular structures sets sulfur apart from other nonmetals that may have fewer allotropes or exhibit different types of molecular arrangements.
• Odor: Sulfur is well-known for its distinctive odor, often described as resembling rotten eggs. This odor is due to the presence of hydrogen sulfide (H₂S), a compound formed by sulfur. The characteristic odor sets sulfur apart in terms of sensory perception compared to other nonmetals.
• Use in industry: Sulfur has significant industrial applications. It is used in the production of sulfuric acid, one of the most widely used industrial chemicals. Sulfur is also used in the production of various chemicals, fertilizers, and in vulcanization processes for rubber. This industrial importance distinguishes sulfur from some other nonmetals that may not have such extensive industrial applications.
• Biological significance: Sulfur is an essential element for living organisms. ¹¹ It is a component of several amino acids, which are the building blocks of proteins. Sulfur is also involved in the structure and function of enzymes and vitamins. This biological significance sets sulfur apart from other nonmetals that may not play as critical a role in biological processes.

Further reading

Is Aluminum a Transition Metal?
Is Aluminum a Metal, Nonmetal or Metalloid?
Is Lead a Transition Metal?
Is Zinc a Transition Metal?
Is Copper a Transition Metal? 

1. Sosa Torres, M. E., Rito Morales, A., Solano Peralta, A., & Kroneck, P. M. H. (2020, March 23). 2. Sulfur, the Versatile Non-metal. Transition Metals and Sulfur – a Strong Relationship for Life, 19–50. https://doi.org/10.1515/9783110589757-008
2. O. (n.d.). Occurrence, Preparation, and Properties of Sulfur – Chemistry. Occurrence, Preparation, and Properties of Sulfur – Chemistry. https://pressbooks-dev.oer.hawaii.edu/chemistry/chapter/occurrence-preparation-and-properties-of-sulfur/
3. Sulfur – Element information, properties and uses | Periodic Table. (n.d.). Sulfur – Element Information, Properties and Uses | Periodic Table. https://www.rsc.org/periodic-table/element/16/sulfur
4. Electron Configuration for Sulfur (S). (n.d.). Electron Configuration for Sulfur (S). https://terpconnect.umd.edu/~wbreslyn/chemistry/electron-configurations/configurationSulfur.html
5. Räisänen, J. (2005). SULFUR. Encyclopedia of Analytical Science, 415–423. https://doi.org/10.1016/b0-12-369397-7/00583-5
6. Sulfur | Definition, Element, Symbol, Uses, & Facts. (n.d.). Encyclopedia Britannica. https://www.britannica.com/science/sulfur
7. STEURER, W. (1996). CRYSTAL STRUCTURE OF THE METALLIC ELEMENTS. Physical Metallurgy, 1–46. https://doi.org/10.1016/b978-044489875-3/50005-3
8. Covalent Bonds vs Ionic Bonds. (2013, October 2). Chemistry LibreTexts. https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Chemical_Bonding/Fundamentals_of_Chemical_Bonding/Covalent_Bonds_vs_Ionic_Bonds
9. Sulfur. (n.d.). Sulfur. https://www.cs.mcgill.ca/~rwest/wikispeedia/wpcd/wp/s/Sulfur.htm
10. Allotropes of sulfur – Wikipedia. (2015, July 1). Allotropes of Sulfur – Wikipedia. https://en.wikipedia.org/wiki/Allotropes_of_sulfur
11. Chemists discover how sulphur is used by organisms. (n.d.). University of York. https://www.york.ac.uk/chemistry/news/deptnews/sulphurorganism/