What main drawbacks of Mendeleev's periodic table have been removed by classification of elements on the basis of atomic number?

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Solution

The main drawbacks of Mendeleev's periodic table have been removed by the classification of elements on the basis of atomic numbers are
Elements that are discovered later do not follow Mendeleev's periodic law, because chemical properties do not depend on atomic mass, they depend on atomic number.
No separate position for isotopes of an element is provided in Mendeleev's periodic table.
Wrong order of some elements was placed in Mendeleev's periodic table for example cobalt (Co) and Nickel (Ni). Cobalt which has high atomic weight was placed first and nickel which has less atomic weight was placed after cobalt.

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Name two elements whose atomic weights are corrected on the basis of their positions in the Mendeleev periodic table.

Which of the following statement is correct in regard to the classification of elements?

(a) Elements in the modern periodic table are arranged on the basis of increasing atomic numbers

(b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers

(c) In the modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.

(d) In the modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

What was the basis of classification of the elements by Mendeleev?

What is the basis of classification of elements in the periodic table?

Which of the following statements (s) about the Modern Periodic table are incorrect?

(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic numbers.

(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.

(iii) Isotopes are placed in adjoining group (s) in the periodic table.

(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic numbers.

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