Question

What are the merits and limitations of the long form of periodic table?

Answer 1

Merits of long-form of the periodic table -

• The atomic number of elements, which is more fundamental than the atomic weight, is used to classify the elements.
• In this periodic table, an element's position is related to the atom's electrical configuration. The number of electrons in the valence shells of elements belonging to the same group is the same, and their chemical properties are similar.
• The gradual loading of electrons in a given shell over time is connected with changes in chemical characteristics over time.
• Because valence shells have an octet configuration, inert gases are inserted at the conclusion of each period in this table. As a result, their immobility can be described in terms of electronic setup.
• Dissimilar elements (e.g., alkali and coinage metals) do not fall together due to the separation of the two classes.

Limitations of long-form of the periodic table -

• Even after the present periodic table was created, the place of Hydrogen remained a point of contention. Because hydrogen has one electron in its valence shell, it has properties that are similar to both alkali metals and halogens. As a result, putting Hydrogen in the IA category isn't entirely justified.
• The elements Lanthanides and Actinides could not be included in the contemporary periodic table's main body.
• The electron distribution of some transition and inner transition elements is not accurately reflected in this periodic table.