This is a SUPER easy guide on Thulium element.
In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Thulium element in Periodic table.)
So if you want to know anything about Thulium element, then this guide is for you.
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Thulium Element (Tm) Information
|Appearance of Thulium|| |
Silvery gray metallic surface
|State of Thulium at STP||Solid|
|Position of Thulium in Periodic table|
Group: lanthanides, Period: 6, Block: f
|Category of Thulium element|
Inner transition metals
|Atomic number of Thulium, or |
Protons in Thulium
|Neutrons in Thulium||100|
|Electrons in Thulium||69|
|Symbol of Thulium||Tm|
|Atomic mass of Thulium|| |
|Electrons arrangement in Thulium|
Bohr model of Thulium
2, 8, 18, 31, 8, 2
|Electronic configuration of Thulium||[Xe] 4f13 6s2|
|Atomic radius of Thulium|
227 picometers (van der Waals radius)
|1st Ionization energy of Thulium||6.184 eV|
|Electronegativity of Thulium|| |
1.25 (Pauling scale)
|Crystal structure of Thulium|
HCP (hexagonal close packed)
|Melting point of Thulium||1818 K or 1545 °C or 2813 °F|
|Boiling point of Thulium||2223 K or 1950 °C or 3542 °F|
|Density of Thulium||9.32 g/cm3|
|Main isotope of Thulium||169Tm|
|Who discovered Thulium and when?|
Per Teodor Cleve (in 1879)
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Thulium in Periodic table
Thulium element is in period 6 and in lanthanide group of the Periodic table. Thulium is the f-block element and it belongs to inner transition metals group.
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Why is Thulium in Period 6?
Let me ask you a question.
How many shells does thulium have?
It’s 6. Right?
You have already seen the bohr model of thulium atom in the above table.
From the Bohr model, it can be found that the number of orbits or shells in thulium is 6. Hence, as thulium has 6 orbits, it lies in period 6 of the Periodic table.
Why is Thulium in f-block?
Before knowing this reason, first of all I want to ask you a simple question.
How can you determine the blocks-wise position of elements?
The simple answer: The elements will lie in the s, p, d or f block will completely depend upon the subshell in which the last electron will enter.
For example; the electron configuration of thulium is [Xe] 6s2 4f13.
So the last electron of thulium enters the f-subshell or f-orbital.
Hence, thulium is the f-block element.
5 Interesting facts about Thulium
Interesting facts about thulium element are mentioned below.
- The name Thulium came from the name “Thule” which is the earliest name of Scandinavia (a region in North Europe).
- Thulium element was discovered by Per Teodor Cleve (in 1879).
- Out of all the rare earth metals present on the periodic table, thulium is the rarest element.
- The concentration of thulium in the earth’s crust is approximately 0.5 ppm by weight.
- Thulium is obtained from the earth’s crust from minerals like monazite, xenotime, gadolinite, etc.
Properties of Thulium
The physical and chemical properties of thulium element are mentioned below.
Physical properties of Thulium
Physical properties of thulium are mentioned below.
- Thulium is a malleable metal having a silver grey metallic appearance.
- Thulium is a soft metal that can be cut with a kitchen knife.
- The melting point of thulium is 1545 °C and its boiling point is 1950 °C.
- The atomic mass of thulium is 168.93 u and its density is 9.32 g/cm3.
- Thulium has many isotopes and out of those isotopes, the most abundant isotope is 169Tm (having an abundance of almost 100%). Rest of the isotopes are synthetic isotopes that are prepared artificially in labs.
Chemical properties of Thulium
Chemical properties of thulium are mentioned below.
- As thulium is a chemically reactive metal, it is not found in free state. But it is always found as a compound with other elements in the earth’s crust.
- When thulium is kept open in the air, it starts tarnishing.
- Thulium reacts with water to form hydroxide and it liberates hydrogen gas during this reaction.
- In compound form, the thulium is present in its trivalent state (i.e Tm3+).
Uses of Thulium
Uses of thulium are mentioned below.
- Thulium is used as an alloying metal with other rare earth elements to get the desired properties.
- As thulium gives blue fluorescence, it is also used in euro currency notes to detect the fake notes.
- Thulium is also used for doping the fibre lasers.
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3). You will also get the HD images of the Periodic table (for FREE).
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Chemical data: Wikipedia, Chemspider
Thulium element: Image by Alchemist-hp (talk) (www.pse-mendelejew.de), FAL, via Wikimedia Commons
Per Teodor Cleve: Image by Osti, Heinrich, 1826-1914, Public domain, via Wikimedia Commons