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Beryllium: chemical element, lightest of the alkaline earth metals, chemical symbol be, atomic number 4.
铍:碱土金属中最轻的化学元素,化学符号Be,原子序数为4。
youdao
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Beryllium: chemical element, lightest of the alkaline earth metals, chemical symbol be, atomic number 4.
铍:碱土金属中最轻的化学元素,化学符号Be,原子序数为4。
youdao