Praseodymium

Praseodymium sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 59, hoà-ha̍k hû-hō sī Pr.

Praseodymium,  ₅₉Pr

Ki-pún sèng-chit
Miâ, hû-hō	praseodymium, Pr
Gōa-hêng	grayish white
Praseodymium tī chiu-kî-piáu lāi ê ūi-tì
– ↑ Pr ↓ Pa cerium ← praseodymium → neodymium
Goân-chú-hoan	59
Goân-chú-liōng (±)	140.90766(2)
Goân-sò͘ lūi-pia̍t	lanthanum-hē
Cho̍k, hun-khu	n/a, f khu
Chiu-kî	tē 6 chiu-kî
Tiān-chú pâi-lia̍t	[Xe] 4f3 6s2
per shell	2, 8, 18, 21, 8, 2
Bu̍t-lí sèng-chit
Siòng	solid
Iûⁿ-tiám	1208 K ​(935 °C, ​1715 °F)
Hut-tiám	3403 K ​(3130 °C, ​5666 °F)
Bi̍t-tō͘  (sek-un)	6.77 g·cm−3
6.50 g·cm−3
Iûⁿ-hoà-jia̍t	6.89 kJ·mol−1
Cheng-hoat-jia̍t	331 kJ·mol−1
Jia̍t-iông-liōng	27.20 J·mol−1·K−1
cheng-khì-ap P (Pa) 1 10 100 1 k 10 k 100 k tī T (K) 1771 1973 (2227) (2571) (3054) (3779)
Goân-chú sèng-chit
Sng-hòa-sò͘	5, 4, 3, 2 ​(a mildly basic oxide)
Tiān-hū-tō͘	Pauling scale: 1.13
Tiān-lī-lêng	1st: 527 kJ·mol−1 2nd: 1020 kJ·mol−1 3rd: 2086 kJ·mol−1
Goân-chú pòaⁿ-kèng	empirical: 182 pm
Kiōng-kè pòaⁿ-kèng	203±7 pm
Cha̍p-lio̍k
Chiⁿ-thé kò͘-chō	​double hexagonal close-packed (dhcp)
Siaⁿ-sok (sòe kùn-á)	2280 m·s−1 (at 20 °C)
Jia̍t-phòng-tiòng	α, poly: 6.7 µm·m−1·K−1 (at r.t.)
Jia̍t-thoân-tō-lu̍t	12.5 W·m−1·K−1
Tiān-chó͘-lu̍t	α, poly: 0.700 µΩ·m (at r.t.)
Chû-sèng	paramagnetic
Young hē-sò͘	α form: 37.3 GPa
Shear hē-sò͘	α form: 14.8 GPa
Bulk hē-sò͘	α form: 28.8 GPa
Poisson pí	α form: 0.281
Vickers ngē-tō͘	250–745 MPa
Brinell ngē-tō͘	250–640 MPa
CAS teng-kì pian-hō	7440-10-0
Le̍k-sú
Hoat-hiān	Carl Auer von Welsbach (1885)
Chòe ún-tēng ê tông-ūi-sò͘
Chú bûn-chiong: praseodymium ê tông-ūi-sò͘
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