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The Periodic Table of Elements
Dmitri Mendeleev generally is credited with the creation of the first periodic table, which charts the chemical elements by atomic number and valence shell electron configuration.
Browse Elements:

en.wikipedia.org/wiki/Period_3_element

A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in ... Sodium (symbol Na) is a soft, silvery- white, highly reactive metal and is a member of the alkali metals; its only stable ...

chemed.chem.purdue.edu/genchem/topicreview/bp/ch9/activity.php

The most active metals are so reactive that they readily combine with the O2 and ... These metals are found exclusively in Groups IA and IIA of the periodic table.

socratic.org/questions/what-are-the-most-reactive-metals-according-to-the-metal-activity-series

Aug 12, 2016 ... The lower the electronegativity, the more reactive the metal will be. In the Periodic Table, electronegativity tends to increase from bottom to top ...

www.reference.com/science/reactive-metals-found-periodic-table-3d35a9ddc6acfbe9

The most reactive metals found on the periodic table are the alkali metals, which are lithium, sodium, potassium, rubidium, caesium and francium. The alkali ...

www.chemicalelements.com/groups/alkali.html

The alkali metals, found in group 1 of the periodic table (formerly known as group IA), are ... Cesium and francium are the most reactive elements in this group.

www.modelscience.com/PeriodicTable.html

The alkali metals, found in group 1 of the periodic table, are highly reactive ... All the elements of Actinides series are radioactive and most are synthetic, that is, ...

www.dynamicscience.com.au/tester/solutions1/chemistry/Reactive%20metals.htm

Sodium is one of the most reactive metals that reacts vigorously with water to release ... The most reactive metals are found on the left of the periodic table, in the ...

www.ck12.org/physical-science/Hydrogen-and-Alkali-Metals-in-Physical-Science/lesson/Hydrogen-and-Alkali-Metals-MS-PS

Oct 31, 2012 ... Sodium (Na) is an element in group 1 of the periodic table of the elements. ... (Li) is the least reactive alkali metal and francium (Fr) is the most reactive. Because alkali metals are so reactive, they are found in nature only in ...

www.richannel.org/the-modern-alchemist-reacting-fluorine-with-caesium

Caesium is found in the far corner here. And it is the most reactive metal in the entire periodic table, even more reactive than Francium. This is a radioactive ...