Question

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

Answer 1

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a) In the Modern Periodic table elements are arranged in the increasing order of their atomic number. This removes the anomaly regarding certain pairs of elements in Mendeleev’s periodic table.

(b) Atomic number of cobalt is 27 and 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

Answer 2

Answer:

1. In the Modern Periodic Table atomic number of an element 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 element 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.