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【单选题】
已知R元素的原子结构示意图如下图，下列说法正确的是【图片】A.
R 元素的原子序数为 36
B.
R 元素是第 4 周期元素
C.
R 元素的最高正化合价为 + 1
D.
R 元素的原子在反应中易失去电子
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