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 |
|---|
|
|
| ngièn-chṳ́ sì-sú |
34 |
|---|
| 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 |
|---|
|
3.99 g·cm−3 |
| lìm-kie-tiám |
1766 K, 27.2 MPa |
|---|
| 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
| |
| Ngièn-chṳ́ sin-chṳt |
|---|
| 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
|
half-life
|
DM
|
DE (MeV)
|
DP
|
| 72Se
|
syn
|
8.4 d
|
ε
|
–
|
72As
|
| γ
|
0.046
|
–
|
| 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
|
| 77Se
|
7.63%
|
77Se is stable with 43 neutrons
|
| 78Se
|
23.78%
|
78Se is stable with 44 neutrons
|
| 79Se
|
trace
|
3.27×105 y
|
β−
|
0.151
|
79Br
|
| 80Se
|
49.61%
|
–
|
(β−β−)
|
0.1339
|
80Kr
|
| 82Se
|
8.73%
|
1.08×1020 y
|
β−β−
|
2.995
|
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.
Chhâm-kháu chṳ̂-liau
