Selenium

Selenium, ₃₄Se
ngoi-kôn
	black, red, and gray (not pictured) allotropes;
Kî-pún sin-sit
Miàng, fù-ho	selenium, Se
ngoi-hìn	black, red, and gray (not pictured) allotropes
Selenium chhai chû-khì-péu ke vi-chi
	phî ← selenium → chhiu
ngièn-chṳ́ sì-sú	34
ngièn-chṳ́-liòng (±)	78.971(8)
ngièn-su lui-phe̍t	tô-ngièn-chṳ́ fî-kîm-su̍k, sometimes considered a metalloid
Chhu̍k, fûn-khî	16 chhu̍k, p-block
chû-khì	period 4
thien-chṳ́ phài-lie̍t	[Ar] 3d10 4s2 4p4
per shell	2, 8, 18, 6
vu̍t-lî sin-chṳt
Siông	ku-thí
yùng-tiám	494 K (221 °C, 430 °F)
pui-tiám	958 K (685 °C, 1265 °F)
Me̍t-thu near Sit-vûn	gray: 4.81 g·cm−3 ; alpha: 4.39 g·cm−3 ; vitreous: 4.28 g·cm−3
	3.99 g·cm−3
lìm-kie-tiám	1766 K, 27.2 MPa
Yùng-fa-ngie̍t	gray: 6.69 kJ·mol−1
Chîn-fat-ngie̍t	95.48 kJ·mol−1
Ngie̍t-yùng-liong	25.363 J·mol−1·K−1
Ngièn-chṳ́ sin-chṳt
Yông-fa-su	6, 5, 4, 3, 2, 1, −1, −2 (a strongly acidic oxide)
Thien-fu-sin	Pauling scale: 2.55
Thien-lì-nèn	1st: 941.0 kJ·mol−1 ; 2nd: 2045 kJ·mol−1 ; 3rd: 2973.7 kJ·mol−1
Ngièn-chṳ́ pan-kang	empirical: 120 pm
Khiung-ka pan-kang	120±4 pm
Van der Waals pan-kang	190 pm