Dysprosium Pronunciation (dis-PROH -zee-əm ) Appearance sillery white Standard atomic weight A r, std (Dy) 7002162500000000000♠ 162.500(1)[1] Dysprosium in the periodic cairt
- ↑Dy ↓ Cf
terbium ← dysprosium → holmium
Atomic nummer (Z ) 66 Group group n/a Period period 6 Block f-block Element category Lanthanide Electron confeeguration [Xe ] 4f10 6s2 Electrons per shell 2, 8, 18, 28, 8, 2 Pheesical properties Phase at STP solit Meltin pynt 1680 K (1407 °C, 2565 °F) Bylin pynt 2840 K (2562 °C, 4653 °F) Density (near r.t. ) 8.540 g/cm3 when liquid (at m.p. ) 8.37 g/cm3 Heat o fusion 11.06 kJ/mol Heat o vapourisation 280 kJ/mol Molar heat capacity 27.7 J/(mol·K) Vapour pressur
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
1378
1523
(1704)
(1954)
(2304)
(2831)
Atomic properties Oxidation states 0,[2] +1, +2, +3 , +4 waikly basic Electronegativity Pauling scale: 1.22 Atomic radius empirical: 178 pm Covalent radius 192±7 pm Colour lines in a spectral range Spectral lines o dysprosium Ither properties Naitural occurrence primordial Creestal structur hexagonal close-packed (hcp) Speed o soond thin rod 2710 m/s (at 20 °C) Thermal expansion (r.t.) (α, poly) 9.9 µm/(m·K) Thermal conductivity 10.7 W/(m·K) Electrical resistivity (r.t.) (α, poly) 926 n Ω·m Magnetic orderin paramagnetic at 300 K Young's modulus (α form) 61.4 GPa Shear modulus (α form) 24.7 GPa Bulk modulus (α form) 40.5 GPa Poisson ratio (α form) 0.247 Vickers haurdness 540 MPa Brinell haurdness 500 MPa CAS Nummer 7429-91-6 History Diskivery Lecoq de Boisbaudran (1886) Main isotopes o dysprosium
Isotope
Abundance
Hauf-life (t 1/2 )
Decay mode
Product
154 Dy
syn
3.0×106 y
α
150 Gd
156 Dy
0.06%
>1×1018 y
α
152 Gd
β+ β+
156 Gd
158 Dy
0.10%
stable
160 Dy
2.34%
stable
161 Dy
18.91%
stable
162 Dy
25.51%
stable
163 Dy
24.90%
stable
164 Dy
28.18%
stable
| references