| ngoi-kôn |
|---|
|
bright, silvery metallic luster |
| Kî-pún sin-sit |
|---|
| Miàng, fù-ho |
Protactinium, Pa |
|---|
| ngoi-hìn |
bright, silvery metallic luster |
|---|
| Protactinium chhai chû-khì-péu ke vi-chi |
|---|
|
|
| ngièn-chṳ́ sì-sú |
91 |
|---|
| ngièn-chṳ́-liòng (±) |
231.03588(2)[1] |
|---|
| ngièn-su lui-phe̍t |
actinium-hi |
|---|
| Chhu̍k, fûn-khî |
n/a, f-block |
|---|
| chû-khì |
period 7 |
|---|
| thien-chṳ́ phài-lie̍t |
[Rn] 5f2 6d1 7s2 |
|---|
| per shell |
2, 8, 18, 32, 20, 9, 2 |
|---|
| vu̍t-lî sin-chṳt |
|---|
| Siông |
ku-thí |
|---|
| yùng-tiám |
1841 K (1568 °C, 2854 °F) |
|---|
| pui-tiám |
4300 K (4027 °C, 7280 °F) (?) |
|---|
| Me̍t-thu near Sit-vûn |
15.37 g·cm−3 |
|---|
| Yùng-fa-ngie̍t |
12.34 kJ·mol−1 |
|---|
| Chîn-fat-ngie̍t |
481 kJ·mol−1 |
|---|
| Ngièn-chṳ́ sin-chṳt |
|---|
| Yông-fa-su |
2, 3, 4, 5 (a weakly basic oxide) |
|---|
| Thien-fu-sin |
Pauling scale: 1.5 |
|---|
| Thien-lì-nèn |
1st: 568 kJ·mol−1 |
|---|
| Ngièn-chṳ́ pan-kang |
empirical: 163 pm |
|---|
| Khiung-ka pan-kang |
200 pm |
|---|
| Miscellanea |
|---|
| Chîn-thí keu-chho |
tetragonal[2] |
|---|
| Ngie̍t-phàng-chong |
~9.9 µm·m−1·K−1[3] (at r.t.) |
|---|
| Ngie̍t-chhòn-thô-li̍t |
47 W·m−1·K−1 |
|---|
| Thien-chú-li̍t |
177 nΩ·m (at 0 °C) |
|---|
| Chhṳ̀-sin |
paramagnetic[4] |
|---|
| CAS Registry Number |
7440-13-3 |
|---|
| Le̍k-sú |
|---|
| Yi-chhet |
Dmitri Mendeleev (1869) |
|---|
| Hoat-kiàn kap siōng chá ê tông-ūi-sò͘ |
William Crookes (1900) |
|---|
| Named by |
Otto Hahn and Lise Meitner (1917–8) |
|---|
| Chui vún-thin ke thùng-vi-su |
|---|
|
Chú vùn-chông: Protactinium ke thùng-vi-su |
| iso
|
NA
|
half-life
|
DM
|
DE (MeV)
|
DP
|
|---|
| 229Pa
|
syn
|
1.5 d
|
ε
|
0.311
|
229Th
| | 230Pa
|
syn
|
17.4 d
|
ε
|
1.310
|
230Th
| | 231Pa
|
100%
|
3.276×104 y
|
α
|
5.150
|
227Ac
| | 232Pa
|
syn
|
1.31 d
|
β−
|
1.337
|
232U
| | 233Pa
|
trace
|
26.967 d
|
β− |
0.5701
|
233U
| | 234Pa
|
trace
|
6.75 h
|
β− |
2.195
|
234U
| | 234mPa
|
trace
|
1.17 min
|
β− |
2.29
|
234U
|
|
