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Mendeleev's Classification Process

In Mendeleev’...

Question

Question 30
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 58.71 amu. Give reason for the same.

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Solution

Cobalt was placed in the group of rhodium (Rh) and iridium (Ir) because it has similar properties to them. Similarly, nickel was placed in the group of palladium (Pd) and platinum (Pt) because it has similar properties to them. In this case, he adjusted the position of the elements to place them with similar elements.

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Similar questions

(a) In the modern periodic Table, why does cobalt with a higher atomic mass of 58.93 appear before nickel having a lower atomic mass of 58.71?

(c) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?

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.

Q. In Mendeleev's periodic table, some elements with higher atomic masses were placed before the elements with lower atomic masses.

Q. According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of:

(a) decreasing atomic numbers
(b) increasing atomic numbers
(c) decreasing atomic masses
(d) increasing atomic masses

Q. The elements in the Mendeleev’s periodic table were arranged in the increasing order of their atomic masses. But, the sequence was inverted so that two elements with similar properties could be grouped together. Identify those two elements.

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Mendeleev's Classification Process

Standard X Chemistry

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