Alkali metal silver, soft and light, malleable. The density is 1.8785 g/cm 3 . The melting point of 28.40 ± 0.01 ° C, the boiling point of 678.4 ° C. The valence price is +1. The ionization energy is 3.894 eV. It is the most active in alkali metals and reacts violently with oxygen to form a mixture of various oxides. In humid air, heat is sufficient to cause oxidation of the melt and ignite cesium. Rhodium does not react with nitrogen, but reacts with hydrogen at elevated temperatures to form a fairly stable hydride. Helium and water, even with ice at temperatures as low as -116 °C, can react violently to produce hydrogen and hydroxide (2Cs + 2H 2 O = 2CsOH + H 2 ↑), and the resulting cesium hydroxide is the most alkaline in alkali hydroxide. Strong. A stable halide can also be formed with halogen due to its large ionic radius. Helium and organic matter also react similarly to other alkali metals, but it is more active. Barium chloride is its main compound.
Earthworm is the most active of alkali metals and can react violently with water. If you put it in a water tank, it will explode immediately, so be careful when reacting.
The cerium salt is dissolved in all the salt solutions as the potassium salt and the sodium salt.
The cockroach produces a layer of gray-blue cerium oxide in the air, which burns in less than a minute and emits a rosy flame, producing cerium peroxide and cerium oxide.
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