Question

What are Anomalous Pairs ? How was their anomaly/abnormality rectified on thebasis of Modern Periodic Law? Explain using an example.`​

Answer 1

Answer:

The Modern Periodic Table could remove various anomalies of Mendeleevs Periodic Table:

a) In the Modern Periodic table elements are arranged in the increasing order of their atomic number, removing the anomaly regarding certain pairs of elements in Mendeleevs periodic table.

b) Atomic number of cobalt is 27and nickel is 28. Hence cobalt will come before nickel even though its atomic mass is greater.

c) All isotopes of the same elements have different atomic masses, but same atomic number; therefore they are placed in the same position in the modern periodic table.

Explanation:

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Answer 2

Answer:

Anomalous pairs are those pairs of elements in which the increasing order of atomic masses was not obeyed.

Explanation:

1. In the Modern Periodic Table atomic number of an elements is a more fundamental property than its atomic mass.

2. The anomalous position of hydrogen can be discussed after we see what are the basis on which the position of an elements in the Modern Periodic Table depends.

3. The elements present in any one group have the same number of valence electrons.

4. Atoms of different elements with the same number of occupied shells are placed in the same period.

5. In the Modern Periodic Table, a zig-zag line separated metals from non-metals.

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