Tm
INTRODUCTION
Thulium is a silvery gray metallic element, and the rarest of the rare earth elements. Thulium is one of the lanthanide series of the periodic table. It is found in small quantities in such rare earth minerals.
Its name was derive from Thule, an ancient Greek name for the northernmost reaches of Europe.
BASIC INFORMATIONS
- Atomic Number
- 69
- Atomic Mass
- 168.93422
- Atomic radius
- 0.156
- Ionization energy
- 1st,2nd,3rd (4038)
- Electronic config
- 2,8,18,31,8,2
- Principal Valency
- +2
- Density g/cm³
- 9.33
- Melting point °C
- 1545
- Boiling point °C
- 1950
- Type of Element
- Metal
- Electronegativity
- N/A
- Element Category
- Lanthanide series
- Appearance
- Silvery gray solid
- Block
- f-block
- Period
- 8
- Group
- 16
- No of Isotopes
- 35
- Occurrence
- Combine form
- Abundance in ppm
- 0.5
- Year of Discovery
- 1879
EXTRACTION
It is obtain by reduction of its oxide
OXIDATION STATES
+2,+3,+4 (weakly basic)
MAJOR SOURCE
Blomstrandine, Euxenite, Gadolinite
EXAMPLES OF COMPOUND PRESENT
Thulium oxide
ECONOMIC IMPORTANCE
* It is applicable in portable X-ray machine that utilizes artificially radioactive thulium as its X-ray source.
