Praseodymyo

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Praseodymium
59Pr
- ↑ Pr ↓ Pa Periodic table cerium ← praseodymium → neodymium
Panagway
grayish white
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	praseodymium, Pr, 59
Paglitok	/preɪziːəˈdɪmiəm/ [[Help:Pronunciation respelling key|pray-zee-ə-Plantilya:Smallcaps all-ee-əm]][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 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) 0.700 µΩ·m
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 141Pr 100% 141Pr is stable with 82 neutrons 142Pr syn 19.12 h β− 2.162 142Nd ε 0.745 142Ce 143Pr syn 13.57 d β− 0.934 143Nd
v t e · r

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.

1. ↑ Plantilya:OED
2. ↑ M. Jackson "Magnetism of Rare Earth" The IRM quarterly col. 10, No. 3, p. 1, 2000