镧在周期表中属于第六周期Ⅲ B 族元素.周期表中镧这一格代表15个镧系元素,由于ⅢB元素钇在矿物中与镧系共生,故常把镧和镧系称为稀土元素.随着科学技术和生产的发展,镧系元素的用途越来越广泛.特别是在一些尖端技术和环境保护方面的应用,以及在农业上被用作微量肥料具有增产效果,使得稀土元素的重要性更 Lanthanide in the periodic table belongs to the sixth cycle of Group III B. Lanthanium in the periodic table This lattice represents 15 lanthanides, because Ⅲ B element yttrium in the mineral and lanthanide symbiosis, so often lanthanum and lanthanide series called rare earth elements With the development of science and technology and production, the use of lanthanide elements is more and more widely.Especially in some cutting-edge technology and environmental protection applications, and in agriculture has been used as a trace fertilizer with yield-increasing effect, making the rare earth elements More importantly