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The functional earth is used for interference suppression. It is a low-impedance current path between the circuitry and earth and is only used to improve the equipment's performance and not (!) for protective purposes.
The alkaline earth metals are one group of elements on the periodic table. Here is a look at the properties of these elements: Location of the Alkaline Earths on the Periodic Table. The alkaline earths are the elements located in Group IIA of the periodic table. Properties of the Alkaline Earth Metals. The alkaline earths possess many of the characteristic properties of metals. Alkaline earths have low electron affinities and low electronegativities. As with the alkali metals, the properties depend on the ease with which electrons are lost. The alkaline earths have two electrons in the outer shell.