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www.livescience.com/34519-rubidium.html

Rubidium is a silvery-white and very soft metal — and one of the most highly reactive elements on the periodic table. Rubidium has a density about one and a half times that of water and is solid ...

www.thoughtco.com/rubidium-facts-rb-or-element-37-606588

Rubidium is the second most electropositive element. Rubidium can be used to give fireworks a red-violet color. Rubidium is the 23 rd most abundant element in the Earth's crust. Rubidium chloride is used in biochemistry as a biomarker to track where potassium is taken up by living organisms.

www.softschools.com/facts/periodic_table/rubidium_facts/212

Interesting Rubidium Facts: Rubidium was discovered by Robert Bunsen and Gustav Kirchhoff in 1861. The pair discovered rubidium spectroscopically, and named it for the red colored spectroscopic lines. At the time, flame spectroscopy was a very new technology. Rubidium is one of the most alkaline elements. It spontaneously ignites in air.

www.chemicool.com/elements/rubidium.html

Rubidium metal can also be produced by reducing rubidium chloride with calcium. Isotopes: Rubidium has 29 isotopes whose half-lives are known, with mass numbers 74 to 102. Naturally occurring rubidium is a mixture of two isotopes, 85 Rb and 87 Rb with natural abundances of 72.2% and 27.8% respectively.

www.factsofworld.com/10-facts-about-rubidium

Facts about Rubidium tell the readers about the chemical element with the atomic number 37. It is symbolized as Rb. The standard atomic weight of Rubidium is 85.4678. It is included in the alkali metal group. Rubidium is characterized in silver white color with soft texture. This metallic element is reactive.

study.com/.../what-is-rubidium-properties-uses-facts.html

Other Rubidium Facts. Rubidium was discovered in 1861 by German chemists Robert Bunsen and Gustav Kirchhoff by a newly developed method of flame spectroscopy while examining the mineral lepidolite.

www.chemistrylearner.com/rubidium.html

Interesting Facts. The ionization energy of rubidium is lower than that of iodine and fluorine. It is because the effective nuclear charge of Rb is much lower than that of the other two elements making it easier to remove an electron from its atom [10]. The flame test of the metal produces a beautiful red-violet colored flame [11].

kids.kiddle.co/Rubidium

Rubidium forms chemical compounds in only one oxidation state: +1.Some rubidium compounds have a mixed oxidation state, though. Rubidium chloride is the most common rubidium compound. Rubidium hydroxide and rubidium carbonate are also used commonly. Rubidium compounds makes a red-violet color in a flame.

hobart.k12.in.us/ksms/PeriodicTable/rubidium.htm

Rubidium Sulfate (Rb 2 SO 4) Interesting facts: It is the 16th most common element in the earth's crust. It is found in North America, Rush and South Africa. It can also be found in seawater and in mineral springs. It is not found freely in nature. It reacts strongly in water and bursts into flames when exposed to air.

www.kidslu.com/science/rubidium.php

Rubidium is the second most electropositive of the stable alkali elements. Rubidium is easily ionized, so it has been considered for use in ion engines for space vehicles. Rubidium compounds are sometimes used in fireworks to give them a purple color.