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Element story

Antimony

Atomic number 51 means that every Antimony nucleus contains 51 protons. That proton count is the element's identity: change it and you no longer have Antimony.

Start with the nucleus

Atomic number 51 means that every Antimony nucleus contains 51 protons. That proton count is the element's identity: change it and you no longer have Antimony.

Antimony (Sb) is chemical element 51. It belongs to the metalloids, and its reference state at room temperature is a solid. Those basic facts are a useful starting point for its chemistry and applications.

In practice, it turns up most often in flame retardants, alloys and semiconductors.

See the atom

Conceptual visual: electron shells are a learning aid, not a literal picture of quantum orbitals.

What this number means

Atomic number 51 means that every Antimony nucleus contains 51 protons. That proton count is the element's identity: change it and you no longer have Antimony.

Keep exploring

→ Antimony · Atomic structure · Periodic trends

51SbAntimony
Antimony · Sb · Z = 51

Antimony (Sb) is chemical element 51. It belongs to the metalloids, and its reference state at room temperature is a solid. Those basic facts are a useful starting point for its chemistry and applications.

Understanding the element

Antimony (Sb) is chemical element 51. It belongs to the metalloids, and its reference state at room temperature is a solid. Those basic facts are a useful starting point for its chemistry and applications.

Where do we encounter it?

In practice, it turns up most often in flame retardants, alloys and semiconductors.

What its position in the table tells us

Antimony sits in period 5, group 15 and the P block. That location is useful because neighbouring elements often share trends in valence electrons, oxidation states and bonding behaviour.