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The Modern Periodic Law makes properties periodic functions of:
AAtomic numbers
BAtomic weights
CAtomic radii
DAtomic volumes
Answer & Solution
Correct answer: A. Atomic numbers
1. Mendeleev had ordered the elements by atomic weight.
2. Moseley's work replaced that ordering by atomic number.
3. So properties are periodic functions of atomic numbers.
_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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