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www.reference.com/article/period-periodic-table-d136127780fc2b7f

A period on the periodic table is a horizontal grouping of elements running from the left to right of the table. Several trends are observed going from the left side of the periodic table to the right.

www.reference.com/article/periodic-table-useful-4414686fee0c5599

The periodic table is useful because it identifies and arranges all known elements in an informative manner. Elements are arranged into periods and families. The elements in each family or period may have similar or dissimilar physical and chemical properties.

www.reference.com/article/periodic-table-work-851db90f4f2f8be1

The periodic table classifies chemical elements by their similarities and properties. Each square in the periodic table shows an element's atomic number, its symbol, its name and its atomic weight, which is the number of protons and neutrons the element has.

www.reference.com/science/periodic-table-called-periodic-table-9dc9c642be8cf361

The periodic table's name comes from the fact that it arranges the elements into repeating sets, otherwise known as "periods." These periods are defined by the covalence of an element, the number of electrons it has in its outermost shell and by other elemental attribut...

www.reference.com/article/periodic-table-organized-d52dcae607b2f536

The elements in the periodic table are organized by their atomic numbers, their electron configurations and the recurring properties found in them. Elements are arranged in blocks, with elements found in that block all containing consistent properties. For instance, all...

www.reference.com/article/group-periodic-table-8293edc0811d0647

A group on the periodic table is one of the vertical columns found on the table. The elements found in the same group all possess the same number of electrons in their outer orbital shell. These electrons are specifically known as valence electrons.

www.reference.com/article/created-periodic-table-253d75362de44432

Dmitri Mendeleev is widely credited as the creator of the periodic table. A charismatic Russian scientist who was fascinated by chemistry, Mendeleev came up with the idea to organize chemical elements according to their atomic number and other properties. The first peri...