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Lutetium (Lu) – Element 71 of the periodic table

Lutetium (symbol Lu) is element number 71 of the periodic table and belongs to the “Lanthanide” category. Its atomic mass is about 174.97, and its phase under standard conditions is Solid. This element sits in period 6 and the f-block (Lanthanides) of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 32, 9, 2. The short electron configuration of Lutetium is [Xe] 4f¹⁴ 5d¹ 6s². Known uses of Lutetium include Petrochemicals, Radiation therapy and Catalyst.

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Properties of Lutetium

Atomic number
71
Chemical symbol
Lu
Atomic mass
174.97
Category
Lanthanide
Period
6
Block
f
Phase
Solid
Protons
71
Electrons
71
Neutrons (approx.)
104
Electron shells
2, 8, 18, 32, 9, 2
Outer-shell electrons
2
Discovered
Georges Urbain (1907)

Electron configuration of Lutetium

The electron configuration of Lutetium (Lu), with 71 electrons, is shown below. The last shell (shell 6) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹ 6s²
Short configuration
[Xe] 4f¹⁴ 5d¹ 6s²
Last shell
6s²

What is electron configuration and how is it written?

Electron shells of Lutetium

Distribution of 71 electrons of Lutetium across shells K to P:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O9
  6. P2

What is a lanthanide?

The lanthanides are the 15 elements from lanthanum to lutetium, part of the f-block, with very similar chemical properties; they are often grouped among the “rare earths”.

Uses of Lutetium

Frequently asked questions about Lutetium

What is the atomic number of Lutetium?

The atomic number of Lutetium (Lu) is 71; that is, every atom of it has 71 protons.

What is the electron configuration of Lutetium?

The electron configuration of Lutetium (Lu) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹ 6s²; in short form it is [Xe] 4f¹⁴ 5d¹ 6s², and its last shell is 6s².

What is the chemical symbol of Lutetium?

The chemical symbol of Lutetium is Lu.

Where is Lutetium located in the periodic table?

Lutetium is located in period 6 and the f-block (Lanthanides) and belongs to the “Lanthanide” category.

What is the atomic mass of Lutetium?

The atomic mass of Lutetium is about 174.97 (atomic mass units).

What is the phase of Lutetium under normal conditions?

The phase of Lutetium under standard conditions is Solid.

What are the uses of Lutetium?

Uses of Lutetium include Petrochemicals, Radiation therapy and Catalyst.

Who discovered Lutetium?

Lutetium was discovered by Georges Urbain in 1907.

Elements in the same category as Lutetium (Lanthanide)

Lanthanum (La)Cerium (Ce)Praseodymium (Pr)Neodymium (Nd)Promethium (Pm)Samarium (Sm)Europium (Eu)Gadolinium (Gd)Terbium (Tb)Dysprosium (Dy)Holmium (Ho)Erbium (Er)Thulium (Tm)Ytterbium (Yb)

See all Lanthanides