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As per your syllabus, using ³⁵Cl (75.77%, mass 34.9689) and ³⁷Cl (24.23%, mass 36.9659), what is the AVERAGE ATOMIC MASS of chlorine?
AAbout 35.45 u
BExactly 36 u
CAbout 36.5 u
DExactly 35.5 u
Answer & Solution
Correct answer: A. About 35.45 u
As per your syllabus, avg = 0.7577×34.9689 + 0.2423×36.9659 ≈ 35.45 u (rounded).
**Hence Cl in periodic table shows 35.5.**
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