鎂者,化學元素也,符號Mg,原子序十二,屬鹼土金屬。色銀白而有光,略可延展,質疏,大有離子化之勢。
置之於空氣,則薄膜生其表,是故為空氣所難併。從醇、水得氫氣也。焚之以帶、粉之狀,強光生焉。置之熱氮中,則生三氮化二鎂。與鹵素反應甚烈,亦可併硫。EDTA滴定,檢測之法也。
同位素者十又三,自鎂二十至鎂三十二。其性唯鎂二十四、鎂二十六、鎂二十七是穩定,餘者咸有放射性。
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