Template:Infobox terbium

Terbium, ₆₅Tb
Terbium
Pronunciation	/ˈtɜːrbiəm/ (TUR-bee-əm)
Appearance	silvery white
Standard atomic weight Ar, std(Tb)	158.925354(8)
Terbium in the periodic cairt
	gadolinium ← terbium → dysprosium
Atomic nummer (Z)	65
Group	group n/a
Period	period 6
Block	f-block
Element category	Lanthanide
Electron confeeguration	[Xe] 4f9 6s2
Electrons per shell	2, 8, 18, 27, 8, 2
Pheesical properties
Phase at STP	solit
Meltin pynt	1629 K (1356 °C, 2473 °F)
Bylin pynt	3503 K (3230 °C, 5846 °F)
Density (near r.t.)	8.23 g/cm3
when liquid (at m.p.)	7.65 g/cm3
Heat o fusion	10.15 kJ/mol
Heat o vapourisation	293 kJ/mol
Molar heat capacity	28.91 J/(mol·K)
Atomic properties
Oxidation states	0, +1, +2, +3, +4 waikly basic
Electronegativity	Pauling scale: ? 1.2
Atomic radius	empirical: 177 pm
Covalent radius	194±5 pm
	Colour lines in a spectral rangeSpectral lines o terbium
Ither properties
Naitural occurrence	primordial
Creestal structur	hexagonal close-packed (hcp)
Speed o soond thin rod	2620 m/s (at 20 °C)
Thermal expansion	(r.t.) (α, poly) 10.3 µm/(m·K)
Thermal conductivity	11.1 W/(m·K)
Electrical resistivity	(r.t.) (α, poly) 1.150 µ Ω·m
Magnetic orderin	paramagnetic at 300 K
Young's modulus	(α form) 55.7 GPa
Shear modulus	(α form) 22.1 GPa
Bulk modulus	(α form) 38.7 GPa
Poisson ratio	(α form) 0.261
Vickers haurdness	863 MPa
Brinell haurdness	677 MPa
CAS Nummer	7440-27-9
History
Diskivery	Carl Gustaf Mosander (1842)
First isolation	Carl Gustaf Mosander (1842)
Main isotopes o terbium
β−	158Dy
	Decay modes in parentheses are predictit, but hae nae yet been observed
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style="text-align:left"\| data m.p. cat v
	in	calc from C	diff	report	ref
C	1356	—	—
K	1629	1629	0
F	2473	2473	0
WD
input	C: 1356, K: 1629, F: 2473
comment

style="text-align:left"\| data b.p. cat v
	in	calc from C	diff	report	ref
C	3230	—	—
K	3503	3500	3	delta
F	5846	5850	-4	delta
WD
input	C: 3230, K: 3503, F: 5846
comment

References

↑ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
↑ Yttrium and all lanthanides except Ce, Pm, Eu, Tm, Yb have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev. 22: 17–24. doi:10.1039/CS9932200017.

[CIAAW2013-1] Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.

[Cloke1993-2] Yttrium and all lanthanides except Ce, Pm, Eu, Tm, Yb have been observed in the oxidation state 0 in bis(1,3,5-tri-t-butylbenzene) complexes, see Cloke, F. Geoffrey N. (1993). "Zero Oxidation State Compounds of Scandium, Yttrium, and the Lanthanides". Chem. Soc. Rev. 22: 17–24. doi:10.1039/CS9932200017.

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