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.
If the atom participates in covalent bonding, the valency tells the number of electrons the atom shares with its partner atom(s) . The following example will clarify the concept of valency: (a) 1 atom of chlorine combines with 1 atom of hydrogen to form HCl (hydrogen chloride). The valency of chlorine is thus 1 (from the definition of valency). (b) 1 atom of oxygen combines with 2 atoms of hydrogen to form H2O (water or hydrogen monoxide).