| Rubidium |
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| Atomic Number - | 37 | Melting Point (°C,°F) - | 39.31 °C, 102.76 °F |
| Atomic Symbol - | Rb | Boiling Point (°C,°F) - | 688 °C, 1270 °F |
| Atomic Mass - | 85.47 | Electron Configuration - | [Kr] 5s1 |
| Group - | 1 | Electrons Per Shell - | 2, 8, 18, 8, 1 |
| Period - | 5 | Protons - | 37 |
| Series - | Alkali Metals | Neutrons - | 48 |
| Block - | d-block | | |
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Element Description - Rubidium is a chemical element in the periodic table that has the symbol Rb and atomic number 37. Rb is a soft, silvery-white metallic element of the alkali metal group. Rb-87, a naturally occurring isotope, is (slightly) radioactive. Rubidium is highly reactive, with properties similar to other elements in group 1, like igniting spontaneously in air. |
Element Characteristics - Rubidium is the second most electropositive of the stable alkaline elements and can be a liquid at room temperature. Like other group 1 elements this metal ignites spontaneously in air and reacts violently in water, liberating and sometimes igniting hydrogen. Also like other alkali metals, it forms amalgams with mercury and it can form alloys with gold, caesium, sodium, and potassium. The element gives a reddish-violet color to a flame, hence its name. |
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