Which of the following is drawback of Mendeleev’s periodic table :

He arranged the known elements in the order of their increasing atomic masses

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He helped in predicting the discovery of new elements

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Iodine having lower atomic mass than Tellurium was placed ahead of Tellurium.

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None of the above

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Solution

The correct option is C Iodine having lower atomic mass than Tellurium was placed ahead of Tellurium.
Mendeleev violated his periodic law at certain places to give appropriate positions to the few elements on the basis of their properties. Iodine (Atomic weight = $126.9$ ) having lower atomic mass than Tellurium (Atomic weight = $127.6$ ) was placed ahead of Tellurium because Iodine showed similar properties with Fluorine, Chlorine and Bromine.

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Similar questions

Q. In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.69 amu. Reason for the same is that :

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

(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

In Mendeleev's periodic table, why does tellurium with atomic mass =127.6 appear before iodine having atomic mass 126.9?

Q. Mendeleev arranged the known elements in a/an ______ order of their atomic masses.

Question 4
Which of the following statement(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 number

(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 number

(a) (i) only
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iv) only

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