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As per your syllabus, the MODERN periodic law (post-Moseley 1913) states that properties of elements are a periodic function of which quantity?
ADensity
BAtomic volume
CAtomic mass
DAtomic NUMBER
Answer & Solution
Correct answer: D. Atomic NUMBER
As per your syllabus, Moseley's X-ray spectra showed Z is more fundamental than atomic mass.
**Hence Modern Periodic Law uses atomic number.**
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