试题与答案

某元素R有两种同位素,可分别表示为85R和87R,若R的近似相对原子质量为85.

题型:选择题

题目:

某元素R有两种同位素,可分别表示为85R和87R,若R的近似相对原子质量为85.5则85R原子的质量分数为

A.75%

B.25%

C.74.6%

D.64.7%

答案:

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Chamber Orchestra: The Orchestra plays at Memorial Hall at 1406 Elm Street, which offers several concerts from March through June. Call 723-1182 for more information. http: //www.chamberorch.com.

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