alleryStart learning →Mendeleev arranged elements in order of:
AAtomic number
BDensity
CAtomic radius
DAtomic mass
Answer & Solution
Correct answer: D. Atomic mass
1. Mendeleev's periodic table came in 1869.
2. He used increasing atomic masses for the order.
3. The modern table later switched to atomic number after Moseley.
4. So Mendeleev used atomic mass.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_
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