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The modern periodic table is based on:
AAtomic mass
BAtomic number
CAtomic radius
DElectron affinity
Answer & Solution
Correct answer: B. Atomic number
1. Moseley used X-ray spectra to assign atomic numbers.
2. He showed that properties varied periodically with atomic number.
3. This corrected anomalies in Mendeleev's mass-based table.
4. So the modern periodic table is based on atomic number.
_Source: NCERT Class 10 Science Ch 5 'Periodic Classification of Elements'_
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