Mendeleev
Periodic table · chemistry · physics
Element story

Mendelevium

Atomic number 101 means that every Mendelevium nucleus contains 101 protons. That proton count is the element's identity: change it and you no longer have Mendelevium.

Start with the nucleus

Atomic number 101 means that every Mendelevium nucleus contains 101 protons. That proton count is the element's identity: change it and you no longer have Mendelevium.

Mendelevium (Md) is chemical element 101. It belongs to the actinoids, 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 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 101 means that every Mendelevium nucleus contains 101 protons. That proton count is the element's identity: change it and you no longer have Mendelevium.

Keep exploring

→ Mendelevium · Atomic structure · Periodic trends

101MdMendelevium
Mendelevium · Md · Z = 101

Mendelevium (Md) is chemical element 101. It belongs to the actinoids, 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

Mendelevium (Md) is chemical element 101. It belongs to the actinoids, 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 scientific research.

What its position in the table tells us

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