Rubidium is the first element placed in period 5. Naturally occurring rubidium is made of … Rubidium can be used to give fireworks a red-violet color. Rubidium is the 23 rd most abundant element in the Earth's crust. The element also has a number of radioactive isotopes that are used in research and dating of ancient fossils. The valency of the rubidium atom, as obtained from a periodic table, is 1, since it lies in Group 1. Rubidium metal can be prepared by reducing rubidium chloride with calcium, and by a number of other methods. Rubidium Rb element 37 Mass Number: 85 Atomic weight: 85.467 g/mol Atomic number (Z): 37 Electrons: 37 Protons: 37 Neutrons: 48 Period: 5 Group: 1 Block: s Rubidium was discovered by German chemists Robert Bunsen and Gustav Kirchhoff in 1861. Rubidium was discovered by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff (DE) in 1861. The hyper-fine electron structure of Rubidium-87 is used in some atomic clocks to maintain accuracy. Its symbol is Rb and it belongs to the group of alkali metals and its usual state in nature is solid. Rubidium is a soft and silvery-white element, which belongs to the alkali metal group. Rubidium chloride is used in biochemistry as a biomarker to track where potassium is taken up by living organisms. Rubidium is located at position 37 on the periodic table. However there is a lot of funny facts about Rubidium that most people don't know. It must be kept under a dry mineral oil or in a vacuum or inert atmosphere. The origin of the name comes from the Latin word rubidius meaning dark red or deepest red.It is a soft, silvery-white, highly reactive metal that ignites in air and reacts violently with water or oxidants. Twenty four isotopes of rubidium are known. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Atomic Number: 37 Period Number: 5 Group Number: 1. Isotopes. It is used in a variety of industries, as well as in laboratories for a range of experiments. Shall we have a look? 37: Rubidium - Rubidium [Rb] Group: 1 Period: 5 Atomic number: 37 Atomic mass: 85.4678 Configuration: [Kr] 5s 1 Atomic radius: 265 pm Covalent radius: 220 pm In the case of Rubidium the group number is 1. Rubidium is a metallic element located in the alkaline group on the periodic table of elements. If the periodic table is complete just scroll up and read the number on the top (from 1 to 18). It is an alkali metal, the most reactive group in the periodic table, having properties and similarities with both other alkali metals and other period 5 elements.For example, rubidium has 5 electron shells, a property found in all other period 5 elements, whereas its electron configuration's ending is similar to all other alkali metals: s 1. Rubidium has the chemical symbol {eq}Rb {/eq} while phosphorus has the symbol {eq}P {/eq}. 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