Per NCERT §3.2, Mendeleev's Periodic Law (1869) stated the properties of elements are a PERIODIC FUNCTION of which quantity?
ATheir atomic WEIGHTS
BTheir valence electrons only
CTheir densities
DTheir atomic numbers
Answer & Solution
Correct answer: A. Their atomic WEIGHTS
Per NCERT §3.2, Mendeleev's original law used atomic weights. Modern law (Moseley) uses atomic numbers.
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