Protactinium

Protactinium,  ₉₁Pa

Ki-pún sèng-chit
Miâ, hû-hō	protactinium, Pa
Gōa-hêng	bright, silvery metallic luster
Protactinium tī chiu-kî-piáu lāi ê ūi-tì
Pr ↑ Pa ↓ (Uqt) thorium ← protactinium → uranium
Goân-chú-hoan	91
Goân-chú-liōng (±)	231.03588(2)
Goân-sò͘ lūi-pia̍t	actinium-hē
Cho̍k, hun-khu	n/a, f khu
Chiu-kî	tē 7 chiu-kî
Tiān-chú pâi-lia̍t	[Rn] 5f2 6d1 7s2
per shell	2, 8, 18, 32, 20, 9, 2
Bu̍t-lí sèng-chit
Siòng	solid
Iûⁿ-tiám	1841 K ​(1568 °C, ​2854 °F)
Hut-tiám	4300 K ​(4027 °C, ​7280 °F) (?)
Bi̍t-tō͘  (sek-un)	15.37 g·cm−3
Iûⁿ-hoà-jia̍t	12.34 kJ·mol−1
Cheng-hoat-jia̍t	481 kJ·mol−1
Goân-chú sèng-chit
Sng-hòa-sò͘	2, 3, 4, 5 ​(a weakly basic oxide)
Tiān-hū-tō͘	Pauling scale: 1.5
Tiān-lī-lêng	1st: 568 kJ·mol−1
Goân-chú pòaⁿ-kèng	empirical: 163 pm
Kiōng-kè pòaⁿ-kèng	200 pm
Cha̍p-lio̍k
Chiⁿ-thé kò͘-chō	​tetragonal
Jia̍t-phòng-tiòng	~9.9 µm·m−1·K−1 (at r.t.)
Jia̍t-thoân-tō-lu̍t	47 W·m−1·K−1
Tiān-chó͘-lu̍t	177 nΩ·m (at 0 °C)
Chû-sèng	paramagnetic
CAS teng-kì pian-hō	7440-13-3
Le̍k-sú
Chhui-chhek	Dmitri Mendeleev (1869)
Hoat-hiān kap siōng chá ê tông-ūi-sò͘	William Crookes (1900)
hō-miâ	Otto Hahn and Lise Meitner (1917–8)
Chòe ún-tēng ê tông-ūi-sò͘
Chú bûn-chiong: protactinium ê tông-ūi-sò͘
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

Protactinium sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 91, hoà-ha̍k hû-hō sī Pa.