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Selenium, 34Se |
|
| Miâ, hû-hō | selenium, Se |
|---|
| Gōa-hêng | black, red, and gray (not pictured) allotropes |
|---|
|
|
|
| Goân-chú-hoan | 34 |
|---|
| Goân-chú-liōng (±) | 78.971(8)[1] |
|---|
| Goân-sò͘ lūi-pia̍t | to-goân-chú hui-kim-sio̍k
sometimes considered a metalloid |
|---|
| Cho̍k, hun-khu | 16 cho̍k, p khu |
|---|
| Chiu-kî | tē 4 chiu-kî |
|---|
| Tiān-chú pâi-lia̍t | [Ar] 3d10 4s2 4p4 |
|---|
| per shell | 2, 8, 18, 6 |
|---|
|
| Siòng | solid |
|---|
| Iûⁿ-tiám | 494 K (221 °C, 430 °F) |
|---|
| Hut-tiám | 958 K (685 °C, 1265 °F) |
|---|
| Bi̍t-tō͘ (sek-un) | gray: 4.81 g·cm−3
alpha: 4.39 g·cm−3
vitreous: 4.28 g·cm−3 |
|---|
| 3.99 g·cm−3 |
| Lîm-kài-tiám | 1766 K, 27.2 MPa |
|---|
| Iûⁿ-hoà-jia̍t | gray: 6.69 kJ·mol−1 |
|---|
| Cheng-hoat-jia̍t | 95.48 kJ·mol−1 |
|---|
| Jia̍t-iông-liōng | 25.363 J·mol−1·K−1 |
|---|
cheng-khì-ap
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| tī T (K)
|
500
|
552
|
617
|
704
|
813
|
958
| |
|
| Sng-hòa-sò͘ | 6, 5, 4, 3, 2, 1,[2] −1, −2 (a strongly acidic oxide) |
|---|
| Tiān-hū-tō͘ | Pauling scale: 2.55 |
|---|
| Tiān-lī-lêng | 1st: 941.0 kJ·mol−1
2nd: 2045 kJ·mol−1
3rd: 2973.7 kJ·mol−1 |
|---|
| Goân-chú pòaⁿ-kèng | empirical: 120 pm |
|---|
| Kiōng-kè pòaⁿ-kèng | 120±4 pm |
|---|
| Van der Waals pòaⁿ-kèng | 190 pm |
|---|
|
| Chiⁿ-thé kò͘-chō | hexagonal |
|---|
| Siaⁿ-sok (sòe kùn-á) | 3350 m·s−1 (at 20 °C) |
|---|
| Jia̍t-phòng-tiòng | amorphous: 37 µm·m−1·K−1 (at 25 °C) |
|---|
| Jia̍t-thoân-tō-lu̍t | amorphous: 0.519 W·m−1·K−1 |
|---|
| Chû-sèng | diamagnetic[3] |
|---|
| Young hē-sò͘ | 10 GPa |
|---|
| Shear hē-sò͘ | 3.7 GPa |
|---|
| Bulk hē-sò͘ | 8.3 GPa |
|---|
| Poisson pí | 0.33 |
|---|
| Mohs ngē-tō͘ | 2.0 |
|---|
| Brinell ngē-tō͘ | 736 MPa |
|---|
| CAS teng-kì pian-hō | 7782-49-2 |
|---|
|
| Hō-miâ | after Selene, Greek goddess of the moon |
|---|
| Hoat-hiān kap siōng chá ê tông-ūi-sò͘ | Jöns Jakob Berzelius and Johann Gottlieb Gahn (1817) |
|---|
|
| Chú bûn-chiong: selenium ê tông-ūi-sò͘ |
| 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 sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 34, hoà-ha̍k hû-hō sī Se.
