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atomic number 105


a transuranic element


substance noun (substance and materials)


atomic number 105's | atomic number 105s

Original source:

Princeton WordNet


Db [chemical formula] | dubnium | element 105 | Ha [chemical formula] | hahnium | unnilpentium [archaic] | Unp [archaic, chemical formula]

Definition references  (+images)


Dubnium | Db

and atomic number 105, named after the town of Dubna in Russia, where it was first produced. It's a synthetic element and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours. In the periodic table of the ... (42 of 4203 words, pronunciation, 4 images)


Random House Dictionary:

unnilpentium [chemistry, physics] | Unp [symbol] | element 105 [synonym] | hahnium [synonym] | Ha [chemistry, symbol]

provisional name for the transuranic element with atomic number 105. (10 of 23 words, pronunciation)


Britannica Encyclopedia:

dubnium | Db [abbreviation]

an artificially produced radioactive transuranium element in Group Vb of the periodic table, atomic number 105. The discovery of dubnium, like that of ... (23 of 331 words, 2 images)


Columbia Encyclopedia:

dubnium | Db [symbol]

artificially produced radioactive chemical element; atomic number 105; mass number of most stable isotope 262; m.p., b.p., and specific gravity ... (20 of 347 words, pronunciation)


Collins Dictionary:

dubnium | hahnium [synonym]

a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105 (20 of 267 words, pronunciation)


American Heritage Dictionary:

dubnium | Db [symbol] | unnilpentium [symbol]

An artificially produced radioactive element with atomic number 105 whose most long-lived isotopes have mass numbers of 258, 261, 262, and 263 with ... (23 of 57 words, pronunciation)


Oxford Dictionary:

dubnium | Db [symbol]

the chemical element of atomic number 105, a very unstable element made by high-energy atomic collisions. | See also "hahnium", "joliotium". (20 of 53 words, 2 definitions, pronunciation)



dubnium | hahnium [dubnium] | unnilpentium [dubnium]

a short-lived radioactive element produced artificially (6 of 43 words, pronunciation)


New World Dictionary:

dubnium | Db [symbol] | unnilpentium | Unp [symbol]

a radioactive chemical element with a very short half-life: a transactinide produced by bombarding californium or berkelium with high-energy nuclear ... (20 of 43 words, pronunciation)



dubnium | Db [chemistry, symbol] | dubniums [French, plural] | Unp [chemistry, symbol, outdated] | eka-tantalum [used before the element was discovered, synonym, sense-specific] | hahnium [proposed by American scientists, synonym, sense-specific] | joliotium [proposed by the IUPAC, but rejected, synonym, sense-specific] | nielsbohrium [proposed by Russian scientists, but rejected, synonym, sense-specific] | unnilpentium [synonym, sense-specific]

A transuranic chemical element (symbol Db) with atomic number 105. | [chemistry, obsolete] A rejected name for rutherfordium. (17 of 18 words, 2 definitions)


Macmillan British Dictionary:

element [countable] | elements [plural] | the elements | be in your element | be out of your element | the elements of something

an important basic part of something complicated, for example a system or plan ; one set of people in a group or organization | [chemistry] a ... (25 of 246 words, 9 definitions, 10 usage examples, pronunciation)


Cambridge Dictionary:

chemical element [specialized]

a substance that cannot be broken down into any simpler chemical substances and is made of atoms all of the same type (22 of 28 words)


Encarta Dictionary:

dubnium [symbol] | Db [symbol]

an extremely rare, unstable element. Source: high-energy bombardment of californium. Db (11 of 23 words, pronunciation)

encarta​.msn​.com​/dictionary 1861739317​/definition​.html  [offline]

Page last updated: 2013-06-26

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