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Periodic table · chemistry · physics
Element story

Europium

Atomic number 63 means that every Europium nucleus contains 63 protons. That proton count is the element's identity: change it and you no longer have Europium.

Start with the nucleus

Atomic number 63 means that every Europium nucleus contains 63 protons. That proton count is the element's identity: change it and you no longer have Europium.

Europium (Eu) is chemical element 63. 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 phosphors, security inks and lasers.

See the atom

Conceptual visual: electron shells are a learning aid, not a literal picture of quantum orbitals.

What this number means

Atomic number 63 means that every Europium nucleus contains 63 protons. That proton count is the element's identity: change it and you no longer have Europium.

Keep exploring

→ Europium · Atomic structure · Periodic trends

63EuEuropium
Europium · Eu · Z = 63

Europium (Eu) is chemical element 63. 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

Europium (Eu) is chemical element 63. 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 phosphors, security inks and lasers.

What its position in the table tells us

Europium 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.