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Dubnium is a synthetic chemical element; it has symbol Db and atomic number 105. It is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 16 hours. This greatly limits extended research on the element.
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element nuclei group 105 niobium tantalum nucleus jinr elements energy atomic fission superheavy chemistry first decay dubna discovery two produced
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Dubnium | 262Db | synth | 1.00 | infobox |
| Dubnium | 263Db | synth | 1.00 | infobox |
| Dubnium | 266Db | synth | 1.00 | infobox |
| Dubnium | 267Db | synth | 1.00 | infobox |
| Dubnium | 268Db | synth | 1.00 | infobox |
| Dubnium | 270Db | synth | 1.00 | infobox |
| Dubnium | Atomic number (Z) | 105 | 1.00 | infobox |
| Dubnium | Atomic radius | empirical: 139 pm (estimated) | 1.00 | infobox |
| Dubnium | Block | d-block | 1.00 | infobox |
| Dubnium | CAS Number | 53850-35-4 | 1.00 | infobox |
| Dubnium | Covalent radius | 149 pm (estimated) | 1.00 | infobox |
| Dubnium | Crystal structure | body-centered cubic (bcc) (predicted) | 1.00 | infobox |
| Dubnium | Density (near r.t.) | 21.6 g/cm3 (predicted) | 1.00 | infobox |
| Dubnium | Discovery | independently by the Lawrence Berkeley Laboratory and the Joint Institute for Nuclear Research (1970) | 1.00 | infobox |
| Dubnium | Electron configuration | [Rn] 5f14 6d3 7s2 | 1.00 | infobox |
| Dubnium | Electrons per shell | 2, 8, 18, 32, 32, 11, 2 | 1.00 | infobox |
| Dubnium | Group | group 5 | 1.00 | infobox |
| Dubnium | Ionization energies | 1st: 665 kJ/mol | 1.00 | infobox |
| Dubnium | Ionization energies | 2nd: 1547 kJ/mol | 1.00 | infobox |
| Dubnium | Ionization energies | 3rd: 2378 kJ/mol | 1.00 | infobox |
| Dubnium | Ionization energies | (more) (all but first estimated) | 1.00 | infobox |
| Dubnium | Main isotopes | .mw-parser-output .isotopes-table{text-align:center;width:100%;border-collapse:collapse;margin:0;padding:0}.mw-parser-output .isotopes-table-headers>:not(:first-child){padding:0… | 1.00 | infobox |
| Dubnium | Naming | after Dubna, Moscow Oblast, Russia, site of Joint Institute for Nuclear Research | 1.00 | infobox |
| Dubnium | Natural occurrence | synthetic | 1.00 | infobox |
| Dubnium | Oxidation states | common: (none) +5 (+3), (+4), (+5) | 1.00 | infobox |
| Dubnium | Period | period 7 | 1.00 | infobox |
| Dubnium | Phase .mw-parser-output .nobold{font-weight:normal}at STP | solid (predicted) | 1.00 | infobox |
| Dubnium | Pronunciation | /ˈduːbniəm/ ⓘ (DOOB-nee-əm) | 1.00 | infobox |
| Dubnium | Pronunciation | /ˈdʌbniəm/ ⓘ (DUB-nee-əm) | 1.00 | infobox |
| Dubnium | is a | synthetic chemical element | 0.90 | text |
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