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粵拼Fong1,Francium),又叫粵拼Faat3),係一種放射性鹼金屬元素,符號係Fr,原子序數87,相對原子質量222.0397,1939年巴黎發現,並且用「法國」嚟起名。

鈁係鹼金屬,由於佢有放射性,而且化學反應極之活躍,因此到而家都整唔到純鈁。

鈁可以喺鈾礦同埋釷礦道發現,亦可以透過以質子轟擊釷而得到。

鈁有41種同位素,其中以鈁-223嘅半衰期最長,大概22分鐘。

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