What is fractional atomic mass? 

Asked by Harshita | 14th Jun, 2017, 01:20: PM

Expert Answer:

It is observed that atomic masses are not whole numbers. The reason is that most natural elements are a mixture of constant composition containing two or more isotopes.

The relative atomic mass of any element is the weighted average of the relative atomic masses of its natural isotopes.

For example chlorine consists of a mixture of two isotopes of masses 35 and 37 in the ratio of 3:1.

Average relative atomic mass of chlorine = (35x3+ 37 x 1) / 4= 35.5

                                                                       

Answered by Vaibhav Chavan | 14th Jun, 2017, 06:03: PM

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