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Rare earth metal gloss between silver and iron. The impurity content has a great influence on their properties, and thus the physical properties often appear in the literature. 镧 is a superconductor at 6°K. Most rare earth metals exhibit paramagnetism, and helium is more ferromagnetic than iron at 0 °C. Terbium, dysprosium, holmium, erbium, etc. at a low temperature also showed ferromagnetism. There are great differences in physical properties of lanthanum, cerium and low melting point samarium, europium, ytterbium, rare earth metal exhibit high vapor pressure gauge. The thermal neutron absorption cross sections of lanthanum, cerium and lanthanum are larger than those of cadmium and boron which are widely used in nuclear reactor control materials. The rare earth metal has plasticity, and it is best to use bismuth. In addition to bismuth, the lanthanum group has higher hardness than the lanthanum group. The chemical activity of rare earth metals is very strong. When reacted with oxygen, a highly stable R 2 O 3 type oxide (R represents a rare earth metal) is formed.铈, 镨 , 铽 also form CeO 2 , Pr 6 O 11 , TbO 2 type oxides. Their standard heat of formation and standard freeness are greater than the values ​​of calcium, aluminum , and magnesium oxide. The melting point of rare earth oxide is above 2000 °C. The atomic radius of cerium is the largest and the most active. It is immediately tarnished when exposed to air at room temperature, and is quickly oxidized into a powder. Lanthanum, cerium is praseodymium, neodymium, also easily oxidized to form an oxide film on the surface. The metal bismuth, antimony and bismuth have strong corrosion resistance and can maintain their metallic luster for a long time. Rare earth metals can react with water at different rates. The hydrazine reacts violently with cold water to release hydrogen. The rare earth metal of the lanthanum group reacts slowly with water at room temperature, and the reaction is accelerated when the temperature is increased. The rare earth metal of the niobium group is relatively stable. The rare earth metal reacts with the halogen at a high temperature to form a halide of +2, +3, +4. The anhydrous halide is highly water-absorptive and easily hydrolyzed to form an ROX (X represents a halogen) type halogen compound. Rare earth metals can also react with boron, carbon, sulfur, hydrogen, and nitrogen to form corresponding compounds.