NCERT Solution Class X Science Periodic Classification of Elements Question 3 (Ex 5.2)

Question 3:

What were the criteria used by Mendeleev in creating his Periodic Table?

Answer:

Mendeleev’s periodic table was based on the observation that the properties

of elements are a periodic function of their atomic masses. This means that if

elements are arranged in the increasing order of their atomic masses, then their

properties get repeated after regular intervals.

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