Electrical Conductance Trends & Definition in Periodic Table Chemistry

The reciprocal of resistance is called Electrical Conductance. The most important property of metals is their ability to conduct electricity. The delocalized electrons in metal give rise to electrical and thermal conductivity.  This property is mainly due to the presence of relatively loose electrons in the outermost shell of the metal and the ease of their movement in the solid.

The electrical conductance of metals in groups IA and IIA generally decreases from top to bottom. Metals of group IB, known as coinage metals have extraordinarily high values of electrical conductance. Non-metals, on the other hand, especially of group VIA and VIIA, show. Such low electrical conductance can be regarded as non-conductors.Electrical Conductance

Carbon, in the form of a diamond, is a non-conductor, while in the form of graphite, it is a fairly good conductor. The lower elements of group IVA, tin, and lead, are fairly good conductor and their values of electrical conductivity are comparable with those of their counterparts in group IA.

In the series of transition metals, the values of electrical conductivity vary so abruptly that no general trend can be assigned to them.

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