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
	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

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

Chham-khó[siu-kái | kái goân-sú-bé]

↑ 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.

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