Question

Write two merits of Mendeleev’s classification of elements.

Answer 1

Refer to the above attachment↑↑↑

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Answer 2

Explanation:

Merits of Mendeleev’s periodic table : Mendeleev’s periodic table was one of the greatest achievements in the development of chemistry. Some of the important contributions of his periodic table are given below ;

(A) Systematic study of elements : He arranged known elements in order of their increasing atomic masses considering the fact that elements with similar properties should fall in the same vertical column.

(B) Correction of atomic masses : The mendeleev’s periodic table could predict errors in the atomic masses of certain elements were corrected. For example, atomic mass of beryllium was corrected from 13.5 to 9. Similarly, with the help of this table, atomic masses of indium, gold, platinum etc. were corrected.

(C) Mendeleev predicated the properties of those missing elements from the known properties of the other elements in the same group.