| 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 chhaichû-khì-péu ke vi-chi |
|---|
|
| ngièn-chṳ́ sì-sú | 34 |
|---|
| ngièn-chṳ́-liòng (±) | 78.971(8)[1] |
|---|
| ngièn-su lui-phe̍t | tô-ngièn-chṳ́ fî-kîm-su̍k,sometimes considered ametalloid |
|---|
| 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-thunear 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 |
|---|
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 stronglyacidic 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 |
|---|
| Miscellanea |
|---|
| Chîn-thí keu-chho | hexagonal |
|---|
| Sâng-sukthin rod | 3350 m·s−1(at 20 °C) |
|---|
| Ngie̍t-phàng-chong | amorphous: 37 µm·m−1·K−1(at 25 °C) |
|---|
| Ngie̍t-chhòn-thô-li̍t | amorphous: 0.519 W·m−1·K−1 |
|---|
| Chhṳ̀-sin | diamagnetic[3] |
|---|
| Young's modulus | 10 GPa |
|---|
| Shear modulus | 3.7 GPa |
|---|
| Bulk modulus | 8.3 GPa |
|---|
| Poisson ratio | 0.33 |
|---|
| Mohs hardness | 2.0 |
|---|
| Brinell hardness | 736 MPa |
|---|
| CAS Registry Number | 7782-49-2 |
|---|
| Le̍k-sú |
|---|
| Hí-miàng | afterSelene, Greek goddess of the moon |
|---|
| Hoat-kiàn kap siōng chá ê tông-ūi-sò͘ | Jöns Jakob Berzelius andJohann Gottlieb Gahn(1817) |
|---|
| Chui vún-thin ke thùng-vi-su |
|---|
| 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 isstable with 42neutrons | | 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 |
