鍅,又譯鈁,化學元素也,符號為Fr,原子序八十七,屬鹼金屬,百金之中,其惟至烈,合水霹靂亟變。電負度其惟最低。易於衰變,富放射能,至穩者廿二分鐘折半。一九三九年,法人佩里始得之,並以祖國為名。
性不穩,所產甚微,遂無見其貌。室溫常壓下,算或為液態、反光、色銀。
同位素三十有五,天然可得者,獨鍅二二一、鍅二二三兩者,性皆不穩。性最穩者,鈁二二三也,人造,廿二分鐘折半,蓋鈾二三五衰變而成,故出於鈾礦也。
聲音動静,具錄於維基共享︰鍅 |
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