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Mendeleev's Periodic Law

In Mendele ...

Question

In Mendele′ev ’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

Mendeleev though he placed elements according to increasing atomic mass he placed some elements according to their similarities in properties. That is why cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu.

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Similar questions

Q. (a) In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
(b) 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. The elements having more masses were placed before elements having lower masses in Mendleev's periodic table. Guess the pair of elements (higher mass, lower mass).

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