Thulium element (Tm) is in period 6 of a periodic table. Thulium is in the f-block and it is classified as a lanthanide on the periodic table.
There is a lot more information related to thulium which is mentioned in the Information Table given below.
So let’s dive right into it!
Table of contents
- Thulium element (Information Table)
- Thulium element in Periodic table
- Facts about Thulium
- Properties of Thulium
- Uses of Thulium
Thulium Element (Information Table)
The important data related to thulium element is given in the table below.
|Appearance of thulium||Silvery white metallic appearance|
|Atomic number of thulium||69|
|Symbol of thulium||Tm|
|Atomic mass of thulium||168.93 u|
|Protons, Neutrons & Electrons in thulium||Protons: 69, Neutrons: 100, Electrons: 69|
|State of thulium (at STP)||Solid|
|Period number of thulium in periodic table||6|
|Block of thulium in periodic table||f-block|
|Category of thulium||Inner transition metals|
|Bohr model or Electrons per shell or Electrons arrangement in thulium||2, 8, 18, 31, 8, 2|
|Electron configuration of thulium||[Xe] 4f13 6s2|
|Orbital diagram of thulium|
|Electronegativity of thulium (on pauling scale)||1.25|
|Atomic radius of thulium (van der Waals radius)||227 picometers|
|Density of thulium||9.32 g/cm3|
|1st ionization energy of thulium||6.184 eV|
|Main isotope of thulium||169Tm|
|Melting point of thulium||1818 K or 1545 °C or 2813 °F|
|Boiling point of thulium||2223 K or 1950 °C or 3542 °F|
|Crystal structure of thulium||Hexagonal Close Packed (HCP)|
|Discovery of thulium||By Per Teodor Cleve in 1803|
Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).
Thulium element in Periodic table
The Thulium element (Tm) has the atomic number 69 and is located in period 6. Thulium is a metal and it is classified as a lanthanide group element.
Facts about thulium
Here are a few interesting facts about thulium element.
- Per Teodor Cleve discovered thulium in the year 1879.
- Thulium was given its name from the region “Thule”. This is the earliest name of Scandinavia (which is a region in North Europe).
- Thulium is only 0.5 ppm by weight in the earth’s crust.
- Thulium is the rarest of the rare earth metals present on the periodic table.
- Majority of thulium is obtained from the ores like monazite, gadolinite and xenotime.
Properties of thulium
Here is a list of some physical properties and chemical properties of thulium.
Physical properties of thulium
- Thulium metal has a silvery white appearance.
- Thulium is soft and it can even be cut with a knife.
- Thulium has a density of 9.32 g/cm3 and its atomic mass is 168.93 amu.
- The melting point and boiling point of thulium is 1818 K and 2223 K respectively.
Chemical properties of thulium
- Thulium tarnishes easily when it is kept open in the air.
- Thulium also reacts with water and forms hydroxide. During this reaction, it liberates hydrogen gas.
- Thulium is reactive metal and because of this it is always found with other compounds from the earth’s crust.
- Thulium is present as a Tm3+ ion in its compounds.
Uses of thulium
Here are some uses of the thulium element.
- Thulium is used as an alloying metal with other metals to get the improved properties.
- Thulium is used for doping the fiber lasers.
- Thulium is also used in eurocurrency notes to detect the fake notes.