Protactinium

Protactinium (Hon-ngî: 鏷 pú) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Pa, ngièn-chṳ́ su-muk he 91.

Protactinium,  ₉₁Pa

ngoi-kôn
bright, silvery metallic luster
Kî-pún sin-sit
Miàng, fù-ho	Protactinium, Pa
ngoi-hìn	bright, silvery metallic luster
Protactinium chhai chû-khì-péu ke vi-chi
Pr ↑ Pa ↓ (Uqt) thorium ← Protactinium → uranium
ngièn-chṳ́ sì-sú	91
ngièn-chṳ́-liòng (±)	231.03588(2)
ngièn-su lui-phe̍t	actinium-hi
Chhu̍k, fûn-khî	n/a, f-block
chû-khì	period 7
thien-chṳ́ phài-lie̍t	[Rn] 5f2 6d1 7s2
per shell	2, 8, 18, 32, 20, 9, 2
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	1841 K ​(1568 °C, ​2854 °F)
pui-tiám	4300 K ​(4027 °C, ​7280 °F) (?)
Me̍t-thu near Sit-vûn	15.37 g·cm−3
Yùng-fa-ngie̍t	12.34 kJ·mol−1
Chîn-fat-ngie̍t	481 kJ·mol−1
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	2, 3, 4, 5 ​(a weakly basic oxide)
Thien-fu-sin	Pauling scale: 1.5
Thien-lì-nèn	1st: 568 kJ·mol−1
Ngièn-chṳ́ pan-kang	empirical: 163 pm
Khiung-ka pan-kang	200 pm
Miscellanea
Chîn-thí keu-chho	​tetragonal
Ngie̍t-phàng-chong	~9.9 µm·m−1·K−1 (at r.t.)
Ngie̍t-chhòn-thô-li̍t	47 W·m−1·K−1
Thien-chú-li̍t	177 nΩ·m (at 0 °C)
Chhṳ̀-sin	paramagnetic
CAS Registry Number	7440-13-3
Le̍k-sú
Yi-chhet	Dmitri Mendeleev (1869)
Hoat-kiàn kap siōng chá ê tông-ūi-sò͘	William Crookes (1900)
Named by	Otto Hahn and Lise Meitner (1917–8)
Chui vún-thin ke thùng-vi-su
Chú vùn-chông: Protactinium ke thùng-vi-su
iso NA half-life DM DE (MeV) DP 229Pa syn 1.5 d ε 0.311 229Th 230Pa syn 17.4 d ε 1.310 230Th 231Pa 100% 3.276×104 y α 5.150 227Ac 232Pa syn 1.31 d β− 1.337 232U 233Pa trace 26.967 d β− 0.5701 233U 234Pa trace 6.75 h β− 2.195 234U 234mPa trace 1.17 min β− 2.29 234U