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Element story

Lawrencium

Atomic number 103 means that every Lawrencium nucleus contains 103 protons. That proton count is the element's identity: change it and you no longer have Lawrencium.

Start with the nucleus

Atomic number 103 means that every Lawrencium nucleus contains 103 protons. That proton count is the element's identity: change it and you no longer have Lawrencium.

Lawrencium (Lr) is chemical element 103. 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 103 means that every Lawrencium nucleus contains 103 protons. That proton count is the element's identity: change it and you no longer have Lawrencium.

Keep exploring

→ Lawrencium · Atomic structure · Periodic trends

103LrLawrencium
Lawrencium · Lr · Z = 103

Lawrencium (Lr) is chemical element 103. 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

Lawrencium (Lr) is chemical element 103. 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

Lawrencium sits in period 7, group 3 and the D block. That location is useful because neighbouring elements often share trends in valence electrons, oxidation states and bonding behaviour.