Protactinium

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
	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

Protactinium he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Pa, ngièn-chṳ́ su-muk he 91.

↑ Standard Atomic Weights 2013. Commission on Isotopic Abundances and Atomic Weights
↑ Donohue, J. (1959). "On the crystal structure of protactinium metal". Acta Crystallographica 12 (9): 697. doi:10.1107/S0365110X59002031.
↑ Cverna, Fran, pian. (2002). "Chapter 2. Thermal Expansion". ASM Ready Reference: Thermal Properties of Metals (PDF). ASM International. p. 11. ISBN 0871707683.
↑ Lide, D. R., pian. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th pán.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.