Dubnium | | Penampilan |
|---|
| tak diketahui | | Ciri-ciri umum |
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| Nama, lambang, Nomor atom | dubnium, Db, 105 |
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| Dibaca | /ˈduːbniəm/
DOOB-nee-əm |
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| Jenis unsur | logam transisi |
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| Golongan, periode, blok | 5, 7, d |
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| Massa atom standar | [268] |
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| Konfigurasi elektron | [Rn] 5f14 6d3 7s2
(predicted)
2, 8, 18, 32, 32, 11, 2
(predicted) |
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| Sifat fisika |
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| Fase | tak diketahui |
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| Sifat atom |
|---|
| Bilangan oksidasi | 5 |
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| Jari-jari kovalen | 149 (estimated)[1] pm |
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| Lain-lain |
|---|
| Nomor CAS | 53850-35-4 |
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| Isotop paling stabil |
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| Artikel utama: Isotop dari dubnium | | iso | NA | Waktu paruh | DM | DE (MeV) | DP |
|---|
| 262Db | syn | 34 s[2][3] | 67% α | 8.66,8.45 | 258Lr | | 33% SF | | | | 263Db | syn | 27 s[3] | 56% SF | | | | 41% α | 8.36 | 259Lr | | 3% ε | | 263mRf | | 266Db | syn | 22 min[3] | SF | | | | ε | | 266Rf | | 267Db | syn | 1.2 h[3] | SF | | | | 268Db | syn | 29 h[3] | SF | | | | ε | | 268Rf | | 270Db | syn | 23.15 h[4] | SF | | | | only half times of over 5 seconds are included here |
| | · r |
Dubnium (pengucapan /ˈduːbniəm/) adalah unsur kimia dalam sistem periodik unsur yang memiliki simbol Db dan nomor atom 105. Unsur ini merupakan unsur sintetik yang bersifat radioaktif. Referensi- ^ Chemical Data. Dubnium - Db, Royal Chemical Society
- ^ Münzenberg, G.; Gupta, M. (2011). Production and Identification of Transactinide Elements. p. 877. doi:10.1007/978-1-4419-0720-2_19.
- ^ a b c d e Six New Isotopes of the Superheavy Elements Discovered. Berkeley Lab. News center. October 26, 2010
- ^ Oganessian, Yu. Ts.; Abdullin, F. Sh.; Bailey, P. D.; Benker, D. E.; Bennett, M. E.; Dmitriev, S. N.; Ezold, J. G.; Hamilton, J. H. et al. (2010). "Synthesis of a New Element with Atomic Number Z=117". Physical Review Letters 104. Bibcode:2010PhRvL.104n2502O. doi:10.1103/PhysRevLett.104.142502. PMID 20481935.
Sumber :
wiki.andrafarm.com, id.wikipedia.org, diskusi.biz, dsb. |
