|
|
| Ymddangosiad
|
|---|
llwydwyn
|
| Nodweddion cyffredinol
|
|---|
| Enw, symbol, rhif
|
rwbidiwm, Rb, 37
|
|---|
| Ynganiad
|
ynganiad: [/]rʉˈbɪdiəmynganiad: [/] roo-BID-ee-əm
|
|---|
| Teulu'r elfennau
|
alkali metal
|
|---|
| Grŵp, cyfnod, bloc
|
1, 5, s
|
|---|
| Rhif atomig
|
85.4678(3)
|
|---|
| Patrwm yr Electronnau
|
[Kr] 5s1 |
|---|
| Electronnau / cragen
|
2, 8, 18, 8, 1 (Image)
|
|---|
| Nodweddion ffisegol
|
|---|
| Stâd
|
solid
|
|---|
| Dwysedd (oddeutu tymheredd yr ystafell)
|
1.532 g·cm−3 |
|---|
| Dwysedd hylif / Ymdoddbwynt
|
1.46 g·cm−3 |
|---|
| Ymdoddbwynt
|
312.46 K, 39.31 °C, 102.76 °F
|
|---|
| Berwbwynt
|
961 K, 688 °C, 1270 °F
|
|---|
| Pwynt critigol
|
(extrapolated) 2093 K, 16 MPa
|
|---|
| Enthalpi ymdoddiad
Gwres o ymdoddi
|
kJ·mol−1 |
|---|
| Enthalpi anweddiad
|
Cynhwysedd gwres
|
31.060 J·mol−1·K−1 |
|---|
| Vapor pressure
|
|---|
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
| | at T (K)
|
434
|
486
|
552
|
641
|
769
|
958
|
|
| Nodweddion Atomig
|
|---|
| cyflwr ocsidiad
|
1
(strongly basic oxide)
|
|---|
| Electronegativity
|
0.82 (Graddfa Pauling)
|
|---|
| Ionization energies
|
1st: 403 kJ·mol−1 |
|---|
| 2: 2632.1 kJ·mol−1 |
| 3ydd: 3859.4 kJ·mol−1 |
| Radiws atomig
|
248 pm
|
|---|
| Radiws cofalent
|
220±9 pm
|
|---|
| Radiws Van der Waals
|
303 pm
|
|---|
| Amrywiol
|
|---|
| Strwythyr y crisal
|
body-centered cubic
|
|---|
| Magnetic ordering
|
paramagnetic[1] |
|---|
| Gwrthedd trydanol
|
(20 °C) 128 nΩ·m
|
|---|
| Dargludiad Thermal
|
58.2 W·m−1·K−1 |
|---|
| Cyflymder sain
|
(20 °C) 1300 m·s−1 |
|---|
| Modwlws Young
|
2.4 GPa
|
|---|
| Modwlws Bulk
|
2.5 GPa
|
|---|
| Graddfa caledwch Mohs
|
0.3
|
|---|
| Brinell hardness
|
0.216 MPa
|
|---|
| CAS registry number
|
7440-17-7
|
|---|
| Most stable isotopes
|
|---|
| Main article: Isotopes of rwbidiwm
|
|
|
| · r
|
