Medication Summary. Topical antibiotics, systemic antibiotics, or a combination of both is effective therapy for impetigo. Empiric bacterial coverage is aimed at eradicating Staphylococcus aureus and group A beta-hemolytic streptococci (GABHS; also known as Streptococcus pyogenes).
In chemistry, the valence or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. The concept of valence was developed in the second half of the 19th century and was successful in explaining the molecular structure of inorganic and organic compounds.
And since all elements with, lets say 2 valence electrons, all go into the same group, and since valence electrons greatly affect chemical properties, elements are grouped by their chemical properties/number of valence electrons. the closer an element is to 0 or 8 valence electrons the more reactive it is.