Praseodymium

Chhiùng Wikipedia lòi
(Chhùng-thin-hiong chhṳ Phú)
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
Khiâng (sûng-ngièn-chṳ́ fî-kîm-su̍k)
Hoi (hî-yù hi-thí)
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Than (tô-ngièn-chṳ́ fî-kîm-su̍k)
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Moscovium (unknown chemical properties)
Livermorium (unknown chemical properties)
Tennessine (unknown chemical properties)
Oganesson (unknown chemical properties)


Pr

Pa
ceriumPraseodymiumneodymium
ngièn-chṳ́ sì-sú 59
ngièn-chṳ́-liòng (±) 140.90766(2)[1]
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-chhodouble hexagonal close-packed (dhcp)
Double hexagonal close packed crystal structure for Praseodymium
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[2]
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

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

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