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{{infobox rubidium}}
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German chemists [[Robert Bunsen]] and [[Gustav Kirchhoff]] discovered rubidium in 1861 by the newly developed technique, [[Atomic emission spectroscopy#Flame emission spectroscopy|flame spectroscopy]]. The name comes from the [[Latin]] word {{lang|la|rubidus}}, meaning deep red, the color of its emission spectrum. Rubidium's compounds have various chemical and electronic applications. Rubidium metal is easily vaporized and has a convenient spectral absorption range, making it a frequent target for [[laser]] manipulation of [[atom]]s.<ref>{{Cite web |title=Rubidium (Rb) {{!}} AMERICAN ELEMENTS ® |url=https://www.americanelements.com/rb.htm |access-date=2024-03-27 |website=American Elements: The Materials Science Company |language=en}}</ref> Rubidium is not a known nutrient for any [[organism|living organisms]]. However, rubidium [[ion]]s have similar properties and the same charge as potassium ions, and are actively taken up and treated by [[animal cell]]s in similar ways.
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