Question 1
Explain why the relative atomic mass of chlorine (35.45) is not a whole number, while the mass numbers of its isotopes are whole numbers.
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Chemistry · Unit 1 · Properties and structure of atoms · Atomic structure
Explain that the relative atomic mass of an element is the ratio of the weighted average mass per atom of the naturally occurring form of the element to 1/12 the mass of an atom of carbon-12. Analytical techniques
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