Db
Dubnium
العنصر 105 · 268.126 u
الفلزات الانتقالية
قطاع د
Period 7
المجموعة 5
Solid at RT
Radioactive
t½ 1.2 days
Synthetic
Wikipedia →
Dubnium's chemistry has been studied using only a few atoms at a time.
Physical Properties
| الكتلة الذرية | 268.126 u |
| الكثافة | 29.3 g/cm³ |
| المظهر | Metallic (predicted) |
| State at Room Temp | Solid |
الخواص الكيميائية
| Oxidation States | +5 |
الخصائص الذرية
| تشكيل الإلكترون | [Rn] 5f14 6d3 7s2 |
اكتشاف
| اكتشفها | Joint Institute for Nuclear Research / Lawrence Berkeley National Laboratory |
| سنة الاكتشاف | 1968 |
| الموقع | Dubna, Russia / Berkeley, USA |
| Named After | Named after Dubna, Russia |
عن Dubnium
Dubnium is a synthetic, radioactive transactinide element. Limited experiments show it behaves somewhat like niobium and tantalum, with some unexpected properties.
Uses & Applications
No practical applications. Scientific research only.
حقيقة مضحكة
Chemical experiments on dubnium use only a few atoms at a time, yet scientists found surprising deviations from predicted behavior.
النظائر
| Mass Number | الوفرة | نصف العمر | Stable |
| 262 | - | 34 seconds | No |
| 268 | - | 1.2 days | No |
تشكيل الإلكترون
[Rn] 5f14 6d3 7s2