Rubidium is a whitish silver-looking chemical element with atomic number 37. 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. Naturally occurring rubidium is made of … 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. 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 chloride is used in biochemistry as a biomarker to track where potassium is taken up by living organisms. Rubidium can be used to give fireworks a red-violet color. 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 The valency of the rubidium atom, as obtained from a periodic table, is 1, since it lies in Group 1. Twenty four isotopes of rubidium are known. Isotopes. Rubidium has the chemical symbol {eq}Rb {/eq} while phosphorus has the symbol {eq}P {/eq}. The element also has a number of radioactive isotopes that are used in research and dating of ancient fossils. The hyper-fine electron structure of Rubidium-87 is used in some atomic clocks to maintain accuracy. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. 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. 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. It must be kept under a dry mineral oil or in a vacuum or inert atmosphere. Rubidium is the first element placed in period 5. It is used in a variety of industries, as well as in laboratories for a range of experiments. Shall we have a look? Rubidium metal can be prepared by reducing rubidium chloride with calcium, and by a number of other methods. Rubidium is located at position 37 on the periodic table. Atomic Number: 37 Period Number: 5 Group Number: 1. 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. 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