某金属氧化物的化学式为M2O3,电子总数为50,每个M离子具有10个电子

某金属氧化物的化学式为M2O3,电子总数为50,每个M离子具有10个电子。若每个氧原子核内都有8个中子,M2O3的相对分子质量为102,则M原子核内的中子数为

A.14                B.13               C.10                  D.21

 

答案

A

解析:

 

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