銣者,化學元素也,符號Rb,原子序三十七,屬鹼金屬。質輕軟,色銀白,遇氧即啞,其性似鈉鉀。
熔點低、質軟,性似於鉀,尤烈之,遇氧即啞。較諸鈉、鉀,遇水反應更烈,爆而生火,並釋氫、生氫氧化銣。
易并鹵族、氧族元素而生化合物。熔融狀態下,可還原鹽以得金屬,對有機物之還原作用甚強。易并氧而生氧化銣。
銣者具暴性、易燃,須以汽油、煤油小心存之,免致災禍。
同位素者四五,自銣七一至銣一〇二。性穩者銣八五矣。餘者皆具放射性。
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