Praseodymium

Praseodymium (Hon-ngî: 鐠 pǔ) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Pr, ngièn-chṳ́ su-muk he 59.

Praseodymium,  ₅₉Pr

ngoi-kôn
grayish white
Kî-pún sin-sit
Miàng, fù-ho	Praseodymium, Pr
ngoi-hìn	grayish white
Praseodymium chhai chû-khì-péu ke vi-chi
– ↑ Pr ↓ Pa cerium ← Praseodymium → neodymium
ngièn-chṳ́ sì-sú	59
ngièn-chṳ́-liòng (±)	140.90766(2)
ngièn-su lui-phe̍t	lanthanum-hi
Chhu̍k, fûn-khî	n/a, f-block
chû-khì	period 6
thien-chṳ́ phài-lie̍t	[Xe] 4f3 6s2
per shell	2, 8, 18, 21, 8, 2
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	1208 K ​(935 °C, ​1715 °F)
pui-tiám	3403 K ​(3130 °C, ​5666 °F)
Me̍t-thu near Sit-vûn	6.77 g·cm−3
6.50 g·cm−3
Yùng-fa-ngie̍t	6.89 kJ·mol−1
Chîn-fat-ngie̍t	331 kJ·mol−1
Ngie̍t-yùng-liong	27.20 J·mol−1·K−1
chîn-hi-ap P (Pa) 1 10 100 1 k 10 k 100 k chhai T (K) 1771 1973 (2227) (2571) (3054) (3779)
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	5, 4, 3, 2 ​(a mildly basic oxide)
Thien-fu-sin	Pauling scale: 1.13
Thien-lì-nèn	1st: 527 kJ·mol−1 2nd: 1020 kJ·mol−1 3rd: 2086 kJ·mol−1
Ngièn-chṳ́ pan-kang	empirical: 182 pm
Khiung-ka pan-kang	203±7 pm
Miscellanea
Chîn-thí keu-chho	​double hexagonal close-packed (dhcp)
Sâng-suk thin rod	2280 m·s−1 (at 20 °C)
Ngie̍t-phàng-chong	α, poly: 6.7 µm·m−1·K−1 (at r.t.)
Ngie̍t-chhòn-thô-li̍t	12.5 W·m−1·K−1
Thien-chú-li̍t	α, poly: 0.700 µΩ·m (at r.t.)
Chhṳ̀-sin	paramagnetic
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	250–745 MPa
Brinell hardness	250–640 MPa
CAS Registry Number	7440-10-0
Le̍k-sú
Fat-hien	Carl Auer von Welsbach (1885)
Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Praseodymium ke thùng-vi-su
iso NA half-life DM DE (MeV) DP 141Pr 100% – (SF) <48.450 142Pr syn 19.12 h β− 2.162 142Nd ε 0.745 142Ce 143Pr syn 13.57 d β− 0.934 143Nd
Decay modes in parentheses have been predicted, but have not yet been observed