rubidium

[ roo-bid-ee-uhm ]

/ ruˈbɪd i əm /

noun Chemistry.

a silver-white, metallic, active element resembling potassium, used in photoelectric cells and radio vacuum tubes. Symbol: Rb; atomic weight: 85.47; atomic number: 37; specific gravity: 1.53 at 20°C.

Origin of rubidium

1860–65; <New Latin, equivalent to Latin rūbid(us) red (in allusion to the two red lines in its spectrum) + -ium-ium

OTHER WORDS FROM rubidium

ru·bid·ic, adjective

Words nearby rubidium

rubeosis iridis diabetica, rubescent, rubiaceous, Rubicon, rubicund, rubidium, rubidium-strontium dating, rubied, rubify, rubiginous, Rubik cube

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for rubidium

Rubidium and cæsium were discovered in this way, rubidium having bright red lines and cæsium a very intense blue line.
An Elementary Study of Chemistry|William McPherson
Rubidium occurs widely diffused in nature, but in very small quantities.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer
Thus Bunsen in 1860 discovered two new alkaline metals, Cæsium and Rubidium.
Logic, Inductive and Deductive|William Minto
Rubidium platino-chloride is much less soluble than the potassium salt.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer

Lithia and fluorine are each present to the extent of about 5%; rubidium and caesium are sometimes present in small amounts.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 4|Various

British Dictionary definitions for rubidium

rubidium

/ (ruːˈbɪdɪəm) /

noun

a soft highly reactive radioactive element of the alkali metal group; the 16th most abundant element in the earth's crust (310 parts per million), occurring principally in pollucite, carnallite, and lepidolite. It is used in electronic valves, photocells, and special glass. Symbol: Rb; atomic no: 37; atomic wt: 85.4678; half-life of 87 Rb: 5 × 10 11 years; valency: 1, 2, 3, or 4; relative density: 1.532 (solid), 1.475 (liquid); melting pt: 39.48°C; boiling pt: 688°C

Derived forms of rubidium

rubidic, adjective

Word Origin for rubidium

C19: from New Latin, from Latin rubidus dark red, with reference to the two red lines in its spectrum

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for rubidium

rubidium

[ rōō-bĭd′ē-əm ]

n. Symbol Rb

A soft metallic element of the alkali group. Atomic number 37.

Scientific definitions for rubidium

rubidium

[ rōō-bĭd′ē-əm ]

Rb

A soft, silvery-white metallic element of the alkali group. It ignites spontaneously in air and reacts violently with water. Rubidium is used in photoelectric cells, in making vacuum tubes, and in radiometric dating. Atomic number 37; atomic weight 85.47; melting point 38.89°C; boiling point 688°C; specific gravity (solid) 1.532; valence 1, 2, 3, 4. See Periodic Table.

单词	rubidium
释义	rubidium [ roo-bid-ee-uhm ] / ruˈbɪd i əm / noun Chemistry. a silver-white, metallic, active element resembling potassium, used in photoelectric cells and radio vacuum tubes. Symbol: Rb; atomic weight: 85.47; atomic number: 37; specific gravity: 1.53 at 20°C. Origin of rubidium 1860–65; <New Latin, equivalent to Latin rūbid(us) red (in allusion to the two red lines in its spectrum) + -ium-ium OTHER WORDS FROM rubidium ru·bid·ic, adjective Words nearby rubidium rubeosis iridis diabetica, rubescent, rubiaceous, Rubicon, rubicund, rubidium, rubidium-strontium dating, rubied, rubify, rubiginous, Rubik cube Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for rubidium Rubidium and cæsium were discovered in this way, rubidium having bright red lines and cæsium a very intense blue line. An Elementary Study of Chemistry\|William McPherson Rubidium occurs widely diffused in nature, but in very small quantities. A Textbook of Assaying: For the Use of Those Connected with Mines.\|Cornelius Beringer and John Jacob Beringer Thus Bunsen in 1860 discovered two new alkaline metals, Cæsium and Rubidium. Logic, Inductive and Deductive\|William Minto Rubidium platino-chloride is much less soluble than the potassium salt. A Textbook of Assaying: For the Use of Those Connected with Mines.\|Cornelius Beringer and John Jacob Beringer Lithia and fluorine are each present to the extent of about 5%; rubidium and caesium are sometimes present in small amounts. Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 4\|Various British Dictionary definitions for rubidium rubidium / (ruːˈbɪdɪəm) / noun a soft highly reactive radioactive element of the alkali metal group; the 16th most abundant element in the earth's crust (310 parts per million), occurring principally in pollucite, carnallite, and lepidolite. It is used in electronic valves, photocells, and special glass. Symbol: Rb; atomic no: 37; atomic wt: 85.4678; half-life of 87 Rb: 5 × 10 11 years; valency: 1, 2, 3, or 4; relative density: 1.532 (solid), 1.475 (liquid); melting pt: 39.48°C; boiling pt: 688°C Derived forms of rubidium rubidic, adjective Word Origin for rubidium C19: from New Latin, from Latin rubidus dark red, with reference to the two red lines in its spectrum Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for rubidium rubidium [ rōō-bĭd′ē-əm ] n. Symbol Rb A soft metallic element of the alkali group. Atomic number 37. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for rubidium rubidium [ rōō-bĭd′ē-əm ] Rb A soft, silvery-white metallic element of the alkali group. It ignites spontaneously in air and reacts violently with water. Rubidium is used in photoelectric cells, in making vacuum tubes, and in radiometric dating. Atomic number 37; atomic weight 85.47; melting point 38.89°C; boiling point 688°C; specific gravity (solid) 1.532; valence 1, 2, 3, 4. See Periodic Table. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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