Chemical series
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A chemical series is a general term to describe a set of chemical elements whose physical and/or chemical characteristics vary progressively from one end of the series to another.
Various chemical series were noted before the creation of the periodic table of the chemical elements, which was created to try to organise the elements according to their chemical properties.
Some examples of chemical series include:
| Alkali metals | (periodic table group 1) |
| Alkaline earth metals | (periodic table group 2) |
| Lanthanides | (periodic table period 6 f-block) |
| Actinides | (periodic table period 7 f-block) |
| Halogens | (periodic table group 17) |
| Noble gases | (periodic table group 18) |