1·By two alkyl halide with alkali metal or alkaline earth metal polysulfides from condensation.
由二卤代烷与碱金属或碱土金属的多硫化物缩聚而成。
2·The difference can be used to improve the separation between alkaline earth and transition metal ions.
这种差异可用于改善碱土金属与过渡金属离子之间的分离状况。
3·The calculated results of energy gap on alkaline earth mixed halides are reasonable.
对碱土金属复卤化物的能隙进行了计算，结果合理。
4·Beryllium: chemical element, lightest of the alkaline earth metals, chemical symbol be, atomic number 4.
铍：碱土金属中最轻的化学元素，化学符号Be，原子序数为4。
5·Orthophosphite ions produced by oxidation of hypophosphite in an electroless nickel plating bath can be removed by precipitation with an alkali metal or alkaline earth metal cation such as calcium.
在无电镀镍浴中因次磷酸根氧化而产生的亚磷酸根离子，可以通过碱金属或碱土金属阳离子如钙的沉淀作用而去除。