21 Chemistry -- Classification of Elements and Periodic Table

 State modern periodic law. Why is modern table superior to Mendeleev's periodic table?

 State modern periodic law. Why is modern table superior to Mendeleev's periodic table?


Ans: Modern periodic law states that, " The physical and chemical properties of elements are the periodic function of their atomic numbers."

Modern periodic table does correct the defects of Mendeleev's Periodic table. It is based on atomic number which is a more fundamental property of the atom. It removes the anomaly about the position of isotopes in the Mendeleev's periodic table. It also removes the other anomalies found in Mendeleev's periodic table like grouping of chemically dissimilar elements and separations of similar elements.

More questions on Classification of Elements and Periodic Table

Which is bigger Li+ or Na+?

SimilarlyLi+would be the smallest because it has only 2 electrons and therefore the least electron- electron repulsion. When comparing F- and Na +, we have to be careful, as both of them have 10 electron,SoNa+is smaller due to thelargerattractive force of the protons.
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