The group of Alkali metals describe the element in column 1 of the Modern Periodic Table.
Explanation:
Elements in the Periodic Table are arranged in the form of rows and columns. Elements in a row are in the increasing order of atomic number and have the same number of shells. Elements in a column have the same number of electrons in their valence shells. Elements in a column are arranged such that they have similar properties.
There are four distinct groups in the periodic table; alkali metals, alkaline earth metals, halogens and noble gases.
The first column of the Periodic table forms the alkali metals family which has the following order down the column; lithium(Li), sodium(Na), potassium(K), rubidium(Rb), cesium(Cs) and francium(Fr). They have similar properties. Alkali metals are soft and can easily be cut. They have very low densities. They also have low melting points.
Reactivity: Alkali metals are the most reactive metals because they only have one valence shell electron.
Keywords: Periodic table, alkali metals, alkaline earth metals, reactivity, elements
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