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碱土金属
鹼土金屬
jiǎntǔjīnshǔ
1. alkaline earth (i.e. beryllium Be [[鈹|铍]], magnesium Mg [[鎂|镁]], calcium Ca [[鈣|钙]], strontium Sr [[鍶|锶]], barium Ba [[鋇|钡]] and radium Ra [[鐳|镭]])