In 1913 Henry Moseley showed that the most fundamental property of an element is its:
AAtomic radius
BAtomic volume
CAtomic number
DAtomic mass
Answer & Solution
Correct answer: C. Atomic number
1. Mendeleev had used atomic mass.
2. Moseley found a better ordering property.
3. That property is the atomic number.
_Source: syllabus Science Class X, Chapter 5, Periodic Classification of Elements._
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