Mendeleev
Periodic table · chemistry · physics
Element story

Holmium

Atomic number 67 means that every Holmium nucleus contains 67 protons. That proton count is the element's identity: change it and you no longer have Holmium.

Start with the nucleus

Atomic number 67 means that every Holmium nucleus contains 67 protons. That proton count is the element's identity: change it and you no longer have Holmium.

Holmium (Ho) is chemical element 67. It belongs to the lanthanoids, 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 lasers, magnets and 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 67 means that every Holmium nucleus contains 67 protons. That proton count is the element's identity: change it and you no longer have Holmium.

Keep exploring

→ Holmium · Atomic structure · Periodic trends

67HoHolmium
Holmium · Ho · Z = 67

Holmium (Ho) is chemical element 67. It belongs to the lanthanoids, 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

Holmium (Ho) is chemical element 67. It belongs to the lanthanoids, 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 lasers, magnets and scientific research.

What its position in the table tells us

Holmium sits in period 6 and the F block. That location is useful because neighbouring elements often share trends in valence electrons, oxidation states and bonding behaviour.