... the first group is called Alkaline metals, the seventh group is called Halogens and the last one, the eighth group, is called noble gases, because of their atomic structure and poor chemical reactivity. Taking a look at the periodic table, on its left-hand side we find the metallic elements, whereas, ... and, at the most right-hand side, we find the gases. The groups are numbered from I to VIII, and these numbers indicated the number of valence electrons of the elements belonging to each group. In other words, an element belonging to the VIth group (for instance, oxygen), has six electr...

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• Grade Level: Undergraduate