Dubnium
Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
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|
| Ìfarahàn |
| unknown, probably silvery, white or metallic gray |
| Àwọn ìní àníkárí |
| Orúkọ, àmì-ìdámọ̀, nọ́mbà |
dubnium, Db, 105 |
| Ẹ̀ka apilẹ̀sẹ̀ |
transition metal |
| Àdìpọ̀, ìgbà, block |
5, 7, d |
| Ìwúwo átọ́mù |
[268] g·mol−1 |
| Ìtòjọ ẹ̀lẹ́ktrónì |
[Rn] 5f14 6d3 7s2
(predicted)
|
| Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan |
2, 8, 18, 32, 32, 11, 2
(predicted) (Image) |
| Àwọn ìní aláfójúrí |
| Phase |
Solid |
| Kíki (tó súnmọ́ r.t.) |
unknown g·cm−3 |
| Atomic properties |
| Oxidation states |
5 |
| Atomic radius (calc.) |
unknown pm |
| Covalent radius |
unknown pm |
| Miscellanea |
| Crystal structure |
unknown |
| CAS registry number |
53850-35-4 |
| Most stable isotopes |
| Main article: Isotopes of dubnium |
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
| 270Db |
syn |
~23.1 h |
SF |
|
|
| 268Db |
syn |
16-32 h |
SF |
|
|
| ε ? |
|
268Rf |
| 267Db |
syn |
1.2 h |
SF |
|
|
| 266Db |
syn |
22 m |
ε |
|
266Rf |
| 263Db |
syn |
27 s |
56% SF |
|
|
| 41% α |
8.36 |
259Lr |
| 3% ε |
|
263mRf |
| 262Db |
syn |
34 s |
67% α |
8.66,8.45 |
258Lr |
| 33% SF |
|
|
| 261Db |
syn |
1.8 s |
α |
8.93 |
257Lr |
| 260Db |
syn |
1.5 s |
α |
9.13,9.08,9.05 |
256Lr |
| 259Db |
syn |
0.5 s |
α |
9.47 |
255Lr |
| 258Db |
syn |
4.4 s |
67% α |
9.17,9.08,9.01 |
254Lr |
| 33% ε |
|
258Rf |
| 257mDb |
syn |
0.76 s |
α |
9.16 |
253Lr |
| 257gDb |
syn |
1.50 s |
α |
9.07,8.97 |
253Lr |
| 256Db |
syn |
1.6 s |
70% α |
9.12,9.08,9.01,8.89 |
253Lr |
| 30% ε |
|
256Rf |
|
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