Thorium

Thorium, ₉₀Th
ngoi-kôn
	silvery, often with black tarnish;
Kî-pún sin-sit
Miàng, fù-ho	thorium, Th
ngoi-hìn	silvery, often with black tarnish
Thorium chhai chû-khì-péu ke vi-chi
	actinium ← thorium → protactinium
ngièn-chṳ́ sì-sú	90
ngièn-chṳ́-liòng (±)	232.0377(4)
ngièn-su lui-phe̍t	actinium-hi
Chhu̍k, fûn-khî	n/a, f-block
chû-khì	period 7
thien-chṳ́ phài-lie̍t	[Rn] 6d2 7s2
per shell	2, 8, 18, 32, 18, 10, 2
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	2023 K (1750 °C, 3182 °F)
pui-tiám	5061 K (4788 °C, 8650 °F)
Me̍t-thu near Sit-vûn	11.724 g·cm−3
Yùng-fa-ngie̍t	13.81 kJ·mol−1
Chîn-fat-ngie̍t	514 kJ·mol−1
Ngie̍t-yùng-liong	26.230 J·mol−1·K−1
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	4, 3, 2, 1
Thien-fu-sin	Pauling scale: 1.3
Thien-lì-nèn	1st: 587 kJ·mol−1 ; 2nd: 1110 kJ·mol−1 ; 3rd: 1930 kJ·mol−1
Ngièn-chṳ́ pan-kang	empirical: 179.8 pm
Khiung-ka pan-kang	206±6 pm