鹼土金屬者,第二族元素也,乃鈹、鎂、鈣、鍶、鋇、鐳。色皆銀白,熔點、硬度皆低,稍高於鹼金屬者也。性稍躍,遇氧則啞,遇水釋氫,生氫氧化物。此等氫氧化物不溶水,只可以鹽基名之。
4 Be 鈹 | |
12 Mg 鎂 | |
20 Ca 鈣 | |
38 Sr 鍶 | |
56 Ba 鋇 | |
88 Ra 鐳 |
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