Ang praseodymyo (Iningles praseodymium ) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Pr ug kaiphan nga atomik 59. Ang praseodymyo mao ang puthaw nga lantanido .
Quick Facts Praseodymium, Panagway ...
Praseodymium
59
Panagway
grayish white
Kinatibuk-ang mga kinaiya
Ngalan, simbolo , kaiphan
praseodymium, Pr, 59
Paglitok
[[Help:Pronunciation respelling key|pray-zee-ə-Plantilya:Smallcaps all ]] [ 1]
Kategoriyang elemento puthaw nga lantanido
Group , period , block [[group {{{group}}} element|{{{group}}}]], 6 , f
Gibug-aton sa atomo 140.90765
Kontorno sa elektron [ Xe ] 4f3 6s2 Electron shells of praseodymium (2, 8, 18, 21, 8, 2)
History
Pagkadiskobre Carl Auer von Welsbach (1885)
Physical properties
Phase magahi
Density (near r.t. )6.77 g·cm−3
Liquid density at m.p.
6.50 g·cm−3
Melting point 1208 K , 935 °C, 1715 °F
Boiling point 3793 K, 3520 °C, 6368 °F
Heat of fusion 6.89 kJ·mol−1
Heat of vaporization 331 kJ·mol−1
Molar heat capacity 27.20 J·mol−1 ·K−1
Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
1771
1973
(2227)
(2571)
(3054)
(3779)
Atomic properties
Oxidation states 4, 3 , 2 (mildly basic oxide)
Electronegativity 1.13 (Pauling scale)
Ionization energies 1st: 527 kJ·mol−1
2nd: 1020 kJ·mol−1
3rd: 2086 kJ·mol−1
Atomic radius 182 pm
Covalent radius 203±7 pm
Miscellanea
Crystal structure hexagonal
Magnetic ordering paramagnetic [ 2]
Electrical resistivity (r.t. ) (α, poly)
Thermal conductivity 12.5 W·m−1 ·K−1
Thermal expansion (r.t. ) (α, poly) 6.7 µm/(m·K)
Speed of sound (thin rod)(20 °C) 2280 m·s−1
Young's modulus (α form) 37.3 GPa
Shear modulus (α form) 14.8 GPa
Bulk modulus (α form) 28.8 GPa
Poisson ratio (α form) 0.281
Vickers hardness 400 MPa
Brinell hardness 481 MPa
CAS registry number 7440-10-0
Most stable isotopes
Main article: Isotopes of praseodymium
iso NA half-life DM DE (MeV ) DP
141 Pr100%
141 Pr is stable with 82 neutrons
142 Prsyn 19.12 h
β− 2.162
142 Nd
ε 0.745
142 Ce
143 Prsyn 13.57 d
β− 0.934
143 Nd
· r
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