Tennessine
Atomic number 117 means that every Tennessine nucleus contains 117 protons. That proton count is the element's identity: change it and you no longer have Tennessine.
Start with the nucleus
Atomic number 117 means that every Tennessine nucleus contains 117 protons. That proton count is the element's identity: change it and you no longer have Tennessine.
Tennessine (Ts) is chemical element 117. It belongs to the halogens, and its reference state at room temperature is not firmly established. Those basic facts are a useful starting point for its chemistry and applications.
In practice, it turns up most often in scientific research.
See the atom
Conceptual visual: electron shells are a learning aid, not a literal picture of quantum orbitals.
What this number means
Atomic number 117 means that every Tennessine nucleus contains 117 protons. That proton count is the element's identity: change it and you no longer have Tennessine.