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Atomic Radius

In group VIII...

Question

In group VIII of the Periodic Table, why does cobalt with atomic mass $58.93$ appear before nickel having atomic mass $58.71$ ?

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Solution

Mendleev's periodic table was based on increasing atomic mass but at some places he gave priority to similar chemical properties and arranged elements with higher atomic mass before lower atomic mass. Therefore, cobalt was placedbefore nickel.

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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?

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

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. According to Mendeleev's periodic table, one element whose atomic mass is greater than that of nickel is placed before nickel. Name the element.

Elements with higher atomic masses can be placed before elements with lower atomic masses in the modern periodic table.

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