Selenium, 34Sengoi-kôn |
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black, red, and gray (not pictured) allotropes
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Kî-pún sin-sit |
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Miàng, fù-ho |
Selenium, Se |
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ngoi-hìn |
black, red, and gray (not pictured) allotropes |
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Selenium chhai chû-khì-péu ke vi-chi |
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|
ngièn-chṳ́ sì-sú |
34 |
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ngièn-chṳ́-liòng (±) |
78.971(8)[1] |
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ngièn-su lui-phe̍t |
tô-ngièn-chṳ́ fî-kîm-su̍k, sometimes considered a metalloid |
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Chhu̍k, fûn-khî |
16 chhu̍k, p-block |
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chû-khì |
period 4 |
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thien-chṳ́ phài-lie̍t |
[Ar] 3d10 4s2 4p4 |
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per shell |
2, 8, 18, 6 |
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vu̍t-lî sin-chṳt |
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Siông |
ku-thí |
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yùng-tiám |
494 K (221 °C, 430 °F) |
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pui-tiám |
958 K (685 °C, 1265 °F) |
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Me̍t-thu near Sit-vûn |
gray: 4.81 g·cm−3 alpha: 4.39 g·cm−3 vitreous: 4.28 g·cm−3 |
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3.99 g·cm−3 |
lìm-kie-tiám |
1766 K, 27.2 MPa |
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Yùng-fa-ngie̍t |
gray: 6.69 kJ·mol−1 |
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Chîn-fat-ngie̍t |
95.48 kJ·mol−1 |
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Ngie̍t-yùng-liong |
25.363 J·mol−1·K−1 |
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chîn-hi-ap
P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
chhai T (K)
|
500
|
552
|
617
|
704
|
813
|
958
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Ngièn-chṳ́ sin-chṳt |
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Yông-fa-su |
6, 5, 4, 3, 2, 1,[2] −1, −2 (a strongly acidic oxide) |
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Thien-fu-sin |
Pauling scale: 2.55 |
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Thien-lì-nèn |
1st: 941.0 kJ·mol−1 2nd: 2045 kJ·mol−1 3rd: 2973.7 kJ·mol−1 |
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Ngièn-chṳ́ pan-kang |
empirical: 120 pm |
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Khiung-ka pan-kang |
120±4 pm |
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Van der Waals pan-kang |
190 pm |
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Miscellanea |
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Chîn-thí keu-chho |
hexagonal |
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Sâng-suk thin rod |
3350 m·s−1 (at 20 °C) |
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Ngie̍t-phàng-chong |
amorphous: 37 µm·m−1·K−1 (at 25 °C) |
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Ngie̍t-chhòn-thô-li̍t |
amorphous: 0.519 W·m−1·K−1 |
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Chhṳ̀-sin |
diamagnetic[3] |
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Young's modulus |
10 GPa |
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Shear modulus |
3.7 GPa |
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Bulk modulus |
8.3 GPa |
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Poisson ratio |
0.33 |
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Mohs hardness |
2.0 |
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Brinell hardness |
736 MPa |
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CAS Registry Number |
7782-49-2 |
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Le̍k-sú |
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Hí-miàng |
after Selene, Greek goddess of the moon |
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Hoat-kiàn kap siōng chá ê tông-ūi-sò͘ |
Jöns Jakob Berzelius and Johann Gottlieb Gahn (1817) |
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Chui vún-thin ke thùng-vi-su |
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Chú vùn-chông: Selenium ke thùng-vi-su |
iso
|
NA
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half-life
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DM
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DE (MeV)
|
DP
|
72Se
|
syn
|
8.4 d
|
ε
|
–
|
72As
|
γ
|
0.046
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–
|
74Se
|
0.87%
|
–
|
(β+β+)
|
1.2094
|
74Ge
|
75Se
|
syn
|
119.779 d
|
ε
|
–
|
75As
|
γ
|
0.264, 0.136, 0.279
|
–
|
76Se
|
9.36%
|
76Se is stable with 42 neutrons
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77Se
|
7.63%
|
77Se is stable with 43 neutrons
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78Se
|
23.78%
|
78Se is stable with 44 neutrons
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79Se
|
trace
|
3.27×105 y
|
β−
|
0.151
|
79Br
|
80Se
|
49.61%
|
–
|
(β−β−)
|
0.1339
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80Kr
|
82Se
|
8.73%
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1.08×1020 y
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β−β−
|
2.995
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82Kr
| |
Decay modes in parentheses are predicted, but have not yet been observed |
Selenium (Hon-ngî: 硒 xī) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Se, ngièn-chṳ́ su-muk he 34.