ଛାଞ୍ଚ:Infobox Erbium

Erbium,  ₆₈Er

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	erbium, Er
Appearance	silvery white
ଉଚ୍ଚାରଣ	/ˈɜːrbiəm/ UR-bee-əm
Erbium in the periodic table
- ↑ Er ↓ Fm holmium ← erbium → thulium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	68
ଶ୍ରେଣୀ, ବ୍ଳକ	group n/a, f-block
ପର୍ଯ୍ୟାୟ	period 6
ମୌଳିକ ପ୍ରକାର	lanthanide
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	167.259
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Xe] 4f12 6s2
per shell	2, 8, 18, 30, 8, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	1802 K ​(1529 °C, ​2784 °F)
ସ୍ଫୁଟନାଙ୍କ	3141 K ​(2868 °C, ​5194 °F)
Density near r.t.	9.066 g/cm3
when liquid, at m.p.	8.86 g/cm3
Heat of fusion	19.90 kJ/mol
Heat of	280 kJ/mol
Molar heat capacity	28.12 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1504 1663 (1885) (2163) (2552) (3132)
Atomic properties
Oxidation states	3, 2, 1 (basic oxide)
Electronegativity	Pauling scale: 1.24
Atomic radius	empirical: 176 pm
Covalent radius	189±6 pm
Miscellanea
Crystal structure	​hexagonal close-packed (hcp)
Speed of sound thin rod	2830 m/s (at 20 °C)
Thermal expansion	(r.t.) (poly) 12.2 µm/(m·K)
Thermal conductivity	14.5 W/(m·K)
Electrical resistivity	(r.t.) (poly) 0.860 µ Ω·m
Magnetic ordering	paramagnetic at 300 K
Young's modulus	69.9 GPa
Shear modulus	28.3 GPa
Bulk modulus	44.4 GPa
Poisson ratio	0.237
Vickers hardness	589 MPa
Brinell hardness	814 MPa
CAS Number	7440-52-0
ଇତିହାସ
ଆବିଷ୍କାର	Carl Gustaf Mosander (1842)
Most stable isotopes of erbium
iso NA half-life DM DE (MeV) DP 160Er syn 28.58 h ε 0.330 160Ho 162Er 0.139% >1.4×1014 y α 1.6460 158Dy β+β+ 1.8445 162Dy 164Er 1.601% 164Er is stable with 96 neutrons 165Er syn 10.36 h ε 0.376 165Ho 166Er 33.503% 166Er is stable with 98 neutrons 167Er 22.869% 167Er is stable with 99 neutrons 168Er 26.978% 168Er is stable with 100 neutrons 169Er syn 9.4 d β− 0.351 169Tm 170Er 14.910% >3.2×1017 y α 0.0502 166Dy β−β− 0.6536 170Yb 171Er syn 7.516 h β− 1.490 171Tm 172Er syn 49.3 h β− 0.891 172Tm

References

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