How could the modern periodic table remove various anomalies of Mendleev‘s periodic table? [3 MARKS]

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Solution

Each point: 1 Mark

Various anomalies are removed in the following ways:

(1) The position for all isotopes of an element justified since they have same atomic number.

(2) The position of certain elements which were earlier misfit like Co- 58.9 was placed before Ni- 58.7, are now justified because Co has lower atomic number than Ni.

(3) Cause of periodicity explained due to repeatition of same electronic configuration and valence electrons after certain gap.

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Similar questions

How could the Modern Periodic Table remove various anomalies of Mendeleev’s Periodic Table?

(a) State modern periodic law.

(b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table?

(d) Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?

(e) Name the scientist who prepared the modern periodic table.

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