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The modern periodic law states that properties of elements are a periodic function of their:
ANumbers of neutrons
BAtomic masses
CAtomic numbers
DDensities
Answer & Solution
Correct answer: C. Atomic numbers
1. After Moseley, atomic number was seen as the most fundamental property.
2. The modern periodic law was restated using atomic number.
3. It reads: properties of elements are a periodic function of their atomic numbers.
4. Rule out B: atomic mass is the basis of Mendeleev's older law.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.29_
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