2012年2月新华网报道，加拿大开发出生产医用放射性同位素99 43Tc的简单方法。下列关于99 43Tc的叙述正确的是（）_刷题宝

题干

2012年2月新华网报道，加拿大开发出生产医用放射性同位素99 43Tc的简单方法。下列关于99 43Tc的叙述正确的是（）

A：原子序数是99

B：电子数是43

C：中子数是99

D：质量数是43

上一题下一题 0.0难度选择题更新时间:2019-06-11 08:26:13

答案(点此获取答案解析）

B

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