Models of Matter A.2 The Nuclear Atom (id: 9fc7ef2c7)

本题目来源于试卷: Models of Matter A.2 The Nuclear Atom，类别为 IB化学

[单选题]
Bromine has 2 stable isotopes: bromine-79 and bromine-81. What is the relative atomic mass of bromine (Br)?
Isotope is $^{79}$Br,Relative Abundance is 50.69%,Atomic Mass is 78.92
Isotope is $^{81}$Br,Relative Abundance is 49.31%,Atomic Mass is 80.92

A. 78.5
B. 80.1
C. 81.2
D. 79.9


参考答案:  D


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