Question

How did the modern periodic table overcome limitations of Mendeleev's periodic table

Answer 1

Answer:

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

IT ALSO OVERCAME MANY OTHER PERIODIC TABLES SUCH NEWLAND'S OCTAVES AND DOBERENEIR'S TRIADS....

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.

Answer 2

The modern periodic table overcome the limitations of Mendeleeff’s periodic table:-

1. Moseley realized that atomic number is the fundamental property of an element than its weight.

2.He arranged the elements in the periodic table according to their atomic numbers.

3. This arrangement removes the problem of atomic weights.

4. In the modern periodic table, isotopes are put together with their elements.

This are the Limitations of Mendleeff’s periodic table that are removed in the modern periodic table :-

1. Certain elements of highest atomic weight precede those with lower atomic weight.

2. Elements having different properties were placed in the same group.

3. Isotopes were discovered long time after Mendeleev put forth the periodic table. As isotopes have the same chemical properties but different atomic masses, a challenge was posed in placing them in Mendeleev’s periodic table.