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单选题 适中0.65 引用1 组卷200
某教材中有下面一段话:For many years chemists were unsuccessfully tried to prepare the perbromate ion,。The first successful synthesis of perbromate involved an isoelectronic species as the starting material。The process is described as following:。以下说法正确的是
A.该过程发生了化学变化B.Br元素的质量数为83
C.中含有68个电子D.互为同位素
23-24高一上·上海·期中
知识点:原子的构成核素原子中相关数值及其之间的相互关系元素、核素、同位素 答案解析 【答案】很抱歉,登录后才可免费查看答案和解析!