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【 在 Kevin3443 的大作中提到: 】
: 锂的原子序数是3，它的相对原子质量到底是多少呢
: :AL，原子量27，3价，9个原子量一个电子，有问题吗？:锂6，钠23，有问题吗？:钠比锂活泼锂比氢活泼，铝比氢活泼有问题
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