Praseodymium

Praseodymium
59Pr
- ↑ Pr ↓ Pa Tábìlì ìdásìkò cerium ← praseodymium → neodymium
Ìhànsójú
grayish white
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	praseodymium, Pr, 59
Ẹ̀ka ẹ́límẹ̀nti	lanthanide
Ẹgbẹ́, àsìkò, àdìpò	n/a, 6, f
Ìwúwo átọ́mù	140.90765
Ìtòléra ẹ̀lẹ́ktrónì	[Xe] 4f3 6s2 2, 8, 18, 21, 8, 2
Physical properties
Phase	solid
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
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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù 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

Praseodymium (pípè /ˌpreɪzi.ɵˈdɪmiəm/ PRAY-zee-o-DIM-ee-əm tabi /ˌpreɪsi.ɵˈdɪmiəm/ PRAY-see-o-DIM-ee-əm) je apilese kemika to ni ami-idamo Pr ati nomba atomu 59.