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Thulium
Atomic number 69
Group, block group n/a, f-block
Period period 6
Element category lanthanide
Standard atomic weight (±) (Ar) 168.93422(2)1
Electron configuration Xe 4f13 6s2
per shell
2, 8, 18, 31, 8, 2
Physical properties
Phase solid
Melting point 1818 K (1545 °C, 2813 °F)
Boiling point 2223 K (1950 °C, 3542 °F)
Density near r.t. 9.32 g/cm3
when liquid, at m.p. 8.56 g/cm3
Heat of fusion 16.84 kJ/mol
Heat of vaporization 191 kJ/mol
Molar heat capacity 27.03 J/(mol·K)
vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1117 1235 1381 1570 (1821) (2217)
Atomic properties
Oxidation states 2, 3 (a basic oxide)
Electronegativity Pauling scale: 1.25
Ionization energies 1st: 596.7 kJ/mol
2nd: 1160 kJ/mol
3rd: 2285 kJ/mol
Atomic radius empirical: 176 pm
Covalent radius 190±10 pm
Miscellanea
Crystal structure hexagonal close-packed (hcp) Hexagonal close packed crystal structure for thulium
Thermal expansion poly: 13.3 µm/(m·K) (at r.t.)
Thermal conductivity 16.9 W/(m·K)
Electrical resistivity poly: 676 nΩ·m (at r.t.)
Magnetic ordering paramagnetic (at 300 K)
Young's modulus 74.0 GPa
Shear modulus 30.5 GPa
Bulk modulus 44.5 GPa
Poisson ratio 0.213
Vickers hardness 470–650 MPa
Brinell hardness 470–900 MPa
CAS Number 7440-30-4
History
Naming after Thule, a mythical region in Scandinavia
Discovery and first isolation Per Teodor Cleve (1879)
My Thulium dissolved into a dilute sulfuric acid last night, While I was studying the 69 electrons surrounding the nucleus.
by S.C.S.C.S.C.S.Cena August 07, 2016
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Oral Sex Where The Male Licks The Females Vagina and the Female Licks The Males Dong
(Jake) “Yo the craziest thing happened to me last night”
(Frank) “What Happened!?!?”
(Jake) “You didn’t hear about it? Me and my girlfriend turned 69”
(Frank) “OMG I’m so jealous.”
by Eeeehhhhhh September 22, 2019
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Simultaneous oral sex. Can be practised by M+M, M+F or F+F.

The reference is that the numerals 6 and 9 are inverted versions of each other, reflecting the physical position that the couple must adopt when engaged in this sexual practice.
The two girls were in a 69, licking each other's pussies.
by starflier December 08, 2003
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1. A common year, starting on a Sunday, of the Julian calendar.

2. 69 BC - A year of the pre-Julian calendar.

3. A number following 68 and preceding 70.

4. A group of sex positions in which two people align themselves so that each person's mouth is near the other's genitals, simultaneously performing oral sex.

5. A roman-a-clef novel by Ryu Murakami.

6. A 2004 film adaptation of Ryu Murakami's novel 69.

7. *69 - A telephone feature code offered by telephone service providers to give a called party the time and telephone number of the last received call, and may also offer the facility to place a call back to the calling party.

8. Texas State Highway 112, formerly designated as State Highway 69 - a short segment highway that runs through the northern portions of Eastland County.

9. Interstate 69 - An Interstate Highway in the United States.
In the year 69, not 69 BC, at 69 years old, I 69'ed the novel 69 after I watched the movie 69. Then, I called my aunt, using *69, then decided to visit her. I took State Highway 69, then took a left of Interstate 69, and pulled up to her house.
by mypetfly June 06, 2010
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When A guy and girl lick each other's privates at the same time
Chad jumped into Kiersten's soft bed and put her in a 69 that lasted all night long!
by SlopNChop December 18, 2016
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