Question detail
Why is the relative atomic mass of an element often not a whole number?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes
Question
Why is the relative atomic mass of an element often not a whole number?
Answer
The relative atomic mass of an element is often not a whole number because it is a weighted average of the masses of its isotopes, taking into account their relative abundances. Since isotopes have different masses and are present in varying proportions, this results in a non-integer value.
Explanation
This answer is strong because it clearly explains the concept of relative atomic mass as an average based on isotopes and their abundances. The question tests the student's understanding of the relationship between isotopes and relative atomic mass.
Common mistake
Understanding Relative Atomic Mass
Students often think that relative atomic mass must be a whole number because it is based on the mass of atoms.
Explain that relative atomic mass is a weighted average of the masses of isotopes, which can result in non-whole number values due to the presence of different isotopes and their relative abundances. Keep the correction anchored to Relative atomic mass and avoid mixing it with nearby Unit 4.1 ideas.
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