Lutetium (Lu) – Periodic Table (Element Information & More)

Lutetium (Lu) element Periodic table

This is a SUPER easy guide on Lutetium element.

In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Lutetium element in Periodic table.)

So if you want to know anything about Lutetium element, then this guide is for you.

Let’s finish this very quickly.

Lutetium Element (Lu) Information

Appearance of Lutetium appearance of lutetium
Silver white appearance
State of Lutetium at STPSolid
Position of Lutetium in Periodic tableLutetium in periodic table (Position)
Group: lanthanides, Period: 6, Block: f
Category of Lutetium elementLutetium element category
Inner transition metals
Atomic number of Lutetium, or 
Protons in Lutetium
71
Neutrons in Lutetium104
Electrons in Lutetium71
Symbol of LutetiumLu
Atomic mass of Lutetium Lutetium (Lu) atomic mass
174.97 u
Electrons arrangement in Lutetium

or 

Bohr model of Lutetium
Bohr model of lutetium (Electrons arrangement in lutetium, Lu)
2, 8, 18, 32, 9, 2
Electronic configuration of Lutetium[Xe] 4f14 5d1 6s2
Atomic radius of LutetiumLutetium (Lu) atomic radius
221 picometers (van der Waals radius)
1st Ionization energy of Lutetium5.426 eV
Electronegativity of Lutetium Electronegativity of lutetium (Lu)
1.27 (Pauling scale)
Crystal structure of Lutetiumcrystal structure of lutetium
HCP (Hexagonal close packed)
Melting point of Lutetium1925 K or 1652 °C or 3006 °F
Boiling point of Lutetium3675 K or 3402 °C or 6156 °F
Density of Lutetium9.84 g/cm3
Main isotope of Lutetium175Lu
Who discovered Lutetium and when?Georges Urbain and Carl Auer von Welsbach (in 1906)
CAS number7439-94-3

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Lutetium in Periodic table

Lutetium element is in period 6 and in lanthanide group of the Periodic table. Lutetium is the f-block element and it belongs to inner transition metals group.

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Why is Lutetium in Period 6?

Why is Lutetium in Period 6

Let me ask you a question.

How many shells does lutetium have?

It’s 6. Right?

You have already seen the bohr model of lutetium atom in the above table.

From the Bohr model, it can be found that the number of orbits or shells in lutetium is 6. Hence, as lutetium has 6 orbits, it lies in period 6 of the Periodic table. 

7 Interesting facts about Lutetium

Interesting facts about lutetium element are mentioned below.

  1. The name “Lutetium” was derived from the word “Lutetia”, which was the ancient name for Paris.
  2. The lutetium element is the last rare earth metal to be discovered.
  3. Lutetium was discovered by Georges Urbain and Carl Auer von Welsbach (in 1906).
  4. The initial name for this element was “lutecium”, but later on the name was changed to “lutetium”.
  5. The concentration of lutetium in the earth’s crust is approximately 0.6 ppm by weight.
  6. Out of all the lanthanides present on the periodic table, the lutetium is the least abundant one.
  7. Lutetium is not found in free state from the earth’s crust, but it is obtained from its mineral ores. The main mineral ore of lutetium is monazite.

Properties of Lutetium

The physical and chemical properties of lutetium element are mentioned below.

Physical properties of Lutetium

Physical properties of lutetium are mentioned below.

  • Lutetium is the hardest lanthanide having a silvery white appearance.
  • The melting point and boiling point of lutetium are 1652 °C and 3402 °C respectively.
  • The atomic mass of 174.97 u and its density is 9.84 g/cm3.
  • The crystal structure of lutetium is HCP (hexagonal close packing).
  • There are many isotopes of lutetium, but out of those isotopes, the most abundant isotope is 175Lu (having an abundance of approximately 97 %).

Chemical properties of Lutetium

Chemical properties of lutetium are mentioned below.

  • When lutetium is kept open in the air, it starts tarnishing slowly.
  • When lutetium is present in its compounds, it exists in its trivalent state (Lu3+).
  • The first ionization energy of lutetium is 5.426 eV.
  • The electronegativity of lutetium is 1.27 on the pauling scale.

Uses of Lutetium

Uses of lutetium are mentioned below.

  • In petrochemical industries, lutetium oxide is used as a catalyst for cracking hydrocarbons. [1]
  • The isotope 177Lu has a long half life and it is used in treatment of cancer.
  • The isotope 176Lu is used in finding the age of meteorites.

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References:
Chemical data: Wikipedia, Chemspider
Lutetium element: Image by Alchemist-hp (talk) (www.pse-mendelejew.de), FAL, via Wikimedia Commons

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