Chemical Periodicity, Periodic Table, Chemical Elements, Chemistry Help

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Chemical Periodicity

Tabular representation of chemical elements is known as periodic table. These chemical elements are arranged according to their properties. The chemical elements which have similar properties or similar chemical behavior are found near to each other in this tabular representation.

This periodic table is now ubiquitous academic discipline of chemistry, providing a useful framework to systematize, classify and compare all of the different forms of chemical behavior. This table has found many applications in physics, chemistry, biology, and engineering, especially chemical engineering.

Structure of Periodic Table

This periodic table separates the actinoids and lanthanoids (the f-block) from other elements. The wide periodic table incorporates the f-block. The extended periodic table adds the 8th and 9th periods, incorporating the f-block and adding the theoretical g-block.
Periodic Table


Groups (Periodic Table):

A group is a vertical column in the chemical periodic table. Groups are considered the most important method of separating or classifying the elements. In most of groups, the elements have similar characteristics or properties and exhibit a clear trend in properties or characteristics down the group.

Periods (Periodic Table)

A period is known as a horizontal row in the chemical periodic table. Mostly groups are the most common way of classifying chemical elements; there are some other regions of the chemical periodic table where the horizontal trends and similarities in properties and characteristics are more significant than vertical group trends. This can be true in the d-block or transition metals and especially for the f-block, where the actinides and lanthanides form two substantial horizontal series of elements.

Blocks (Periodic Tables)

The importance of the outermost shell, the different regions of the chemical periodic table are referred to as periodic table blocks, named according to subshell in which the "last" electron resides. The s-block comprises the first two groups namely alkaline earth metals and alkali metals as well ashelium and hydrogen. The p-block comprises the last six groups which are groups 13 through 18 in IUPAC (3A through 8A in American) and contains, among others, all of thesemimetals. The d-block comprises groups 3 through 12 in IUPAC (or 3A through 8A in American group numbering) and contains all of the transition metals. The f-block, usually offset below the rest of the periodic table, comprises thelanthanides and actinides.


The chemical elements are grouped together in other ways as well. Some of these groupings are often illustrated on the periodic table, such as poor metals, transition metals and metalloids. Other informal groupings exist, such as the noble metals and platinum group.

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