Dubnium By: Heather Begley Period 4 How Dubnium Came to be…

Dubnium

• By:Heather Begley

• Period 4

How Dubnium Came to be…

• Discover(s): Alberto Ghiorso and team labrotory in Russia

• Year: 1967-1970

• Where: Dubna, Russia and University of California, Berkley

• Meaning of name: named after Dubna, Russia (large dispute on name) Joint Institute for Nuclear Research at Dubna

Basic Info

• Symbol: Db

• Atomic Mass: 262.114

• Atomic Number: 105

• Group: 5 (transition metals)

• Standard State: Solid

• CAS number: 53850-35-4

• Block on the Element chart: d

• Color: unknown (assumed to be silver or metallic grey)

• Metal

• Used for: Only been created a couple of times and specifically only used for research

• Not found pure in nature

Synthesizing

• The first time that Dubnium was synthesized was in 1967. It was created by bombarding americium with neon to produce two isotopes: 260 and 261

• The second synthesis of Dubnium occurred in 1970 but with the use of nitrogen and californium (which was hit with a beam of nitrogen nuclei). Another isotope of dubnium was produced, number 260

More Info…

• Where in the house will it be found: nowhere (made only in labs)
• What does Dubnium look like in pure nature: not found in nature
• % in Universe: man made not found anywhere
• % in Earth: man made not found anywhere
• % in Humans: man made not found anywhere
• % in Fresh Waters: man made not found anywhere

Melting Point: unknown

• Melting Point: unknown

• Boiling Point: unknown

• Density: 29,000 kg/m^3

• Hardness: none

• Health Hazards: unknown (radioactive)

• Electron negativity: unknown

• Compounds:none

• Allotropes: none

• Lattice energy: none

React with air?: unknown

• React with air?: unknown
• React with water?: unknown
• React with acids?: unknown
• Crystal structure: unknown
• Heat of fusion: unknown
• Heat of vaporation: unknown
• Electron configuration:
• [Rn] 5f14 6d3 7s2
• Atomic radii: unknown
• Oxidation number: 0

Isotopes

Work Cited

• http://www.rsc.org/chemsoc/visualelements/pages/pdf/dubnium.PDF
• http://www.webelements.com/dubnium/chemistry.html
• http://www.chemprofessor.com/Elements/Db.html
• http://www.wisegeek.com/what-is-dubnium.htm