| 单词 | 碱金属 |
| 释义 | 〔ammonium〕The univalent chemical ion NH4+, derived from ammonia, whose compounds chemically resemble the alkali metals. 铵：从氨中衍生而来的单价化学离子NH4+，其化合物在化学性质上类似碱金属 〔francium〕An extremely unstable radioactive element of the alkali metals, produced artificially from actinum or thorium, having approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1. See table at element 钫：从碱金属锕或钍中人工提炼出的一种极不稳定的放射线元素，约有19种同位素，其中最稳定的是半衰期为21分钟的Fr223。原子序数为87；化合价为1 参见 element〔alkali〕A carbonate or hydroxide of an alkali metal, the aqueous solution of which is bitter, slippery, caustic, and characteristically basic in reactions.碱：碱金属的碳酸盐或氢氧化物，其水解溶液味苦、滑腻、有腐蚀性且在反应中呈碱性 |
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