Rubidium metal can be prepared by reducing rubidium chloride with calcium, and by a number of other methods. If the periodic table is complete just scroll up and read the number on the top (from 1 to 18). Rubidium is the 23 rd most abundant element in the Earth's crust. Rubidium is a metallic element located in the alkaline group on the periodic table of elements. 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 Rubidium is the first element placed in period 5. It must be kept under a dry mineral oil or in a vacuum or inert atmosphere. Rubidium is located at position 37 on the periodic table. Rubidium has the chemical symbol {eq}Rb {/eq} while phosphorus has the symbol {eq}P {/eq}. Rubidium chloride is used in biochemistry as a biomarker to track where potassium is taken up by living organisms. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Rubidium is a whitish silver-looking chemical element with atomic number 37. Shall we have a look? Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Isotopes. Atomic Number: 37 Period Number: 5 Group Number: 1. Rubidium is a soft and silvery-white element, which belongs to the alkali metal group. Its symbol is Rb and it belongs to the group of alkali metals and its usual state in nature is solid. 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. 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. In the case of Rubidium the group number is 1. Twenty four isotopes of rubidium are known. 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 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. 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