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Modern Periodic Law

In the modern...

Question

In the modern periodic table why does cobalt having higher atomic mass of 58.93 appear before nickel having atomic mass of 58.71?
[TEXTBOOK QUESTION- 4(2)]

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Solution

Modern periodic table arranges the elements according to increasing atomic number , so the atomic number of cobalt (27) comes first whereas the atomic number of nickel (28) comes later.

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Q. In group VIII of periodic table,why does cobalt with atomic mass 58.93 appear before nickel having atomic mass 58.71?

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. 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.

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.

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