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.
For metals, it is more convenient to define valency in terms of the number of chlorine atoms with which one metal atom combines to form their normal chlorides. Thus, the valencies of sodium, magnesium and aluminium are 1, 2 and 3 as they form NaCl, MgCl2 and AlCl3 in the atomic ratios 1:1, 1:2 and 1:3 respectively.