 |
Ytterbium |
---|
Pronunciation | (ih-TUR-bee-əm) |
---|
Appearance | sillery white |
---|
Standard atomic weight Ar, std(Yb) | 7002173045000000000♠173.045(10)[1] |
---|
Mass number | Yb: |
---|
Ytterbium in the periodic cairt |
---|
|
Atomic nummer (Z) | 70 |
---|
Group | group n/a |
---|
Period | period 6 |
---|
Block | f-block |
---|
Element category | Lanthanide |
---|
Electron confeeguration | [Xe] 4f14 6s2 |
---|
Electrons per shell | 2, 8, 18, 32, 8, 2 |
---|
Pheesical properties |
---|
Phase at STP | solit |
---|
Meltin pynt | 1097 K (824 °C, 1515 °F) |
---|
Bylin pynt | 1469 K (1196 °C, 2185 °F) |
---|
Density (near r.t.) | 6.90 g/cm3 |
---|
when liquid (at m.p.) | 6.21 g/cm3 |
---|
Heat o fusion | 7.66 kJ/mol |
---|
Heat o vapourisation | 159 kJ/mol |
---|
Molar heat capacity | 26.74 J/(mol·K) |
---|
Vapour pressur
P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
---|
at T (K)
|
736
|
813
|
910
|
1047
|
(1266)
|
(1465)
|
---|
|
Atomic properties |
---|
Oxidation states | +1, +2, +3 (a basic oxide) |
---|
Electronegativity | Pauling scale: ? 1.1 |
---|
Atomic radius | empirical: 176 pm |
---|
Covalent radius | 187±8 pm |
---|
Spectral lines o ytterbium |
Ither properties |
---|
Naitural occurrence | Yb: Primordial |
---|
Creestal structur | face-centred cubic (fcc) |
---|
Speed o soond thin rod | 1590 m/s (at 20 °C) |
---|
Thermal expansion | (r.t.) (β, poly) 26.3 µm/(m·K) |
---|
Thermal conductivity | 38.5 W/(m·K) |
---|
Electrical resistivity | (r.t.) (β, poly) 0.250 µ Ω·m |
---|
Magnetic orderin | paramagnetic |
---|
Young's modulus | (β form) 23.9 GPa |
---|
Shear modulus | (β form) 9.9 GPa |
---|
Bulk modulus | (β form) 30.5 GPa |
---|
Poisson ratio | (β form) 0.207 |
---|
Vickers haurdness | 206 MPa |
---|
Brinell haurdness | 343 MPa |
---|
CAS Nummer | 7440-64-4 |
---|
History |
---|
Diskivery | Jean Charles Galissard de Marignac (1878) |
---|
First isolation | Georges Urbain (1907) |
---|
Main isotopes o ytterbium |
---|
|
Decay modes in parentheses are predictit, but hae nae yet been observed |
| references |