Mendeleev
Periodic table · chemistry · physics
Element story

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.

Keep exploring

→ Tennessine · Atomic structure · Periodic trends

117TsTennessine
Tennessine · Ts · Z = 117

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.

Understanding the element

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.

Where do we encounter it?

In practice, it turns up most often in scientific research.

What its position in the table tells us

Tennessine sits in period 7, group 17 and the P block. That location is useful because neighbouring elements often share trends in valence electrons, oxidation states and bonding behaviour.