Radium, 88Ra|
silvery white metallic
 |
|
| Miàng, fù-ho | Radium, Ra |
|---|
| ngoi-hìn | silvery white metallic |
|---|
|
|
| ngièn-chṳ́ sì-sú | 88 |
|---|
| ngièn-chṳ́-liòng | (226) |
|---|
| ngièn-su lui-phe̍t | kán-thú kîm-su̍k |
|---|
| Chhu̍k, fûn-khî | 2 chhu̍k, s-block |
|---|
| chû-khì | period 7 |
|---|
| thien-chṳ́ phài-lie̍t | [Rn] 7s2 |
|---|
| per shell | 2, 8, 18, 32, 18, 8, 2 |
|---|
|
| Siông | ku-thí |
|---|
| yùng-tiám | 973 K (700 °C, 1292 °F) (disputed) |
|---|
| pui-tiám | 2010 K (1737 °C, 3159 °F) |
|---|
| Me̍t-thu near Sit-vûn | 5.5 g·cm−3 |
|---|
| Yùng-fa-ngie̍t | 8.5 kJ·mol−1 |
|---|
| Chîn-fat-ngie̍t | 113 kJ·mol−1 |
|---|
chîn-hi-ap
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| chhai T (K) |
819 |
906 |
1037 |
1209 |
1446 |
1799 |
|
|
| Yông-fa-su | 2 (expected to have a strongly basic oxide) |
|---|
| Thien-fu-sin | Pauling scale: 0.9 |
|---|
| Thien-lì-nèn | 1st: 509.3 kJ·mol−1
2nd: 979.0 kJ·mol−1 |
|---|
| Khiung-ka pan-kang | 221±2 pm |
|---|
| Van der Waals pan-kang | 283 pm |
|---|
|
| Chîn-thí keu-chho | body-centered cubic (bcc) |
|---|
| Ngie̍t-chhòn-thô-li̍t | 18.6 W·m−1·K−1 |
|---|
| Thien-chú-li̍t | 1 µΩ·m (at 20 °C) |
|---|
| Chhṳ̀-sin | nonmagnetic |
|---|
| CAS Registry Number | 7440-14-4 |
|---|
|
| Fat-hien | Pierre Curie and Marie Curie (1898) |
|---|
| First isolation | Marie Curie (1910) |
|---|
|
| Chú vùn-chông: Radium ke thùng-vi-su |
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
| 223Ra |
trace |
11.43 d |
α |
5.99 |
219Rn |
| 224Ra |
trace |
3.6319 d |
α |
5.789 |
220Rn |
| 225Ra |
trace |
14.9 d |
β− |
0.356 |
225Ac |
| 226Ra |
trace |
1600 y |
α |
4.871 |
222Rn |
| 228Ra |
trace |
5.75 y |
β− |
0.046 |
228Ac |
|
Radium (Hon-ngî: 鐳 léi) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Ra, ngièn-chṳ́ su-muk he 88.
