rubidium

ru·bid·i·um

 (ro͞o-bĭd′ē-əm)

n. Symbol Rb

A soft silvery-white metallic element of the alkali group that ignites spontaneously in air and reacts violently with water, used in photocells and as a getter in the manufacture of vacuum tubes. Atomic number 37; atomic weight 85.47; melting point 39.30°C; boiling point 688°C; specific gravity (solid) 1.532; valence 1, 2, 3, 4. See Periodic Table.

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[From Latin rūbidus, red; see reudh- in Indo-European roots.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

rubidium

(ruːˈbɪdɪəm)

n

(Elements & Compounds) 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 ⁸⁷Rb: 5 × 10¹¹ years; valency: 1, 2, 3, or 4; relative density: 1.532 (solid), 1.475 (liquid); melting pt: 39.48°C; boiling pt: 688°C

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

ruˈbidic adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ru•bid•i•um

(ruˈbɪd i əm)

n.

a silver-white, metallic, active element resembling potassium, used in photoelectric cells and radio vacuum tubes. Symbol: Rb; at. wt.: 85.47; at. no.: 37; sp. gr.: 1.53 at 20°C.

[< German (1861), = Latin rūbid(us) red (in allusion to the two red lines in its spectrum) + -ium -ium²]

ru•bid′ic, adj.

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

ru·bid·i·um

(ro͞o-bĭd′ē-əm)

Symbol Rb A soft, silvery-white element that is an alkali metal. It ignites spontaneously in air and reacts violently with water. Rubidium is used in photoelectric cells and in making vacuum tubes. Atomic number 37. See Periodic Table.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Thesaurus

Noun

1.

rubidium - a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite atomic number 37, Rb metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. carnallite - a white or reddish mineral consisting of hydrous chlorides of potassium and magnesium; used as a fertilizer and as a source of potassium and magnesium lepidolite - a mineral of the mica group; an important source of lithium pollucite - a rare mineral that is an important source of cesium

Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

Translations

рубидий

rubidium

rubidium

Rubidium

rubidio

rubidio

rubiidium

rubidium

rubidium

rubidij

rubídium

rúbidín

rubidio

ルビジウム

rubidis

rubidium

rubidium

rubid

rubídio

rubidiu

рубидий

rubidium

rubidij

rubidium

rubidyum

rubidium

[ruːˈbɪdɪəm] N → rubidio m

Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005

rubidium

n (Chem) → Rubidium nt

Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007