銫者,化學元素也,符號為Cs,原子序五十五,屬鹼金屬、第六週期。性輕軟,色銀白,遇氧而火,性似鈉、鉀。熔點甚低,僅攝氏二十八度。自然之中,不以獨存,必以化合,併氯而為氯化銫,存於大海。又性烈,亟合於水,霹靂而生氫氣、氫氧化銫,故貯於煤油。夫氫氧化銫者,當世最強鹼也。
一八六一年,德意志化學家本生及基爾霍夫以焰色試驗辨銫,始得之。
銫同位素,起銫一一二,迄銫一五一,性穩者惟銫一三三,其餘皆易於衰變。
聲音動靜,具錄於維基共享︰銫 |
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