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The modern periodic law states that the properties of elements are a periodic function of which property?
AAtomic mass
BAtomic number
CAtomic radius
DAtomic volume
Answer & Solution
Correct answer: B. Atomic number
1. Mendeleev's table, based on atomic mass, had anomalies such as argon before potassium.
2. Moseley showed atomic number is the fundamental property.
3. The modern periodic law states properties are a periodic function of atomic number.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 8 Periodic Classification of Elements "Modern Periodic Law", p.114_
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