Sulfur
Atomic number 16 means that every Sulfur nucleus contains 16 protons. That proton count is the element's identity: change it and you no longer have Sulfur.
Start with the nucleus
Atomic number 16 means that every Sulfur nucleus contains 16 protons. That proton count is the element's identity: change it and you no longer have Sulfur.
Sulfur (S) is chemical element 16. It belongs to the nonmetals, 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 fertiliser production, sulfuric acid and rubber vulcanisation.
See the atom
Conceptual visual: electron shells are a learning aid, not a literal picture of quantum orbitals.
What this number means
Atomic number 16 means that every Sulfur nucleus contains 16 protons. That proton count is the element's identity: change it and you no longer have Sulfur.