2023年10月10日 · Rubidium is a soft, silvery-white metallic element of the alkali metal group, known for its strikingly colorful flame test. People encounter rubidium in specialized applications such as atomic clocks, medical research, and occasionally in fireworks for its characteristic red-purple flame coloration.

Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. [9] Rubidium is the first alkali metal in the group to have a density higher than water.

2019年7月3日 · Get periodic table facts on the chemical and physical properties of the element rubidium. Rubidium is atomic number 37 with element symbol Rb.

Rubidium, chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. Rubidium is the second most reactive metal and is very soft, with a silvery-white luster.

2016年9月10日 · 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...

Rubidium is a soft, silvery-white metallic element. It is solid at room temperature but melts easily, at 39.3 o C. Like the other group 1 metals, rubidium reacts violently with water, forming corrosive rubidium hydroxide (RbOH) and hydrogen gas, which is ignited by the heat of the reaction. Rubidium can also ignite spontaneously in air.

Rubidium is ductile metal and used for various purposes. It has a melting point of 39.3°C and have a low density, 1.532 g/cm 3. Rubidium is a very reactive metal. It undergoes rapid oxidation in the presence of air. Rubidium burns with a purplish flame like potassium.