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.
An element's oxidation number, sometimes called valence, is the number of electrons gained or lost when forming compounds. This characteristic is controlled by the electrons in the outer energy level (valence electrons). Atoms gain or lose electrons to get eight electrons in their outer shell.Elements with a positive oxidation number (usually metals) lose electrons when forming compounds. Atoms with more than 4 electrons in their outer level tend to gain electrons to form compounds. 2  A helium atom only has one energy level (#1), which has only one sublevel (s). 3  The 1s level can only hold two electrons. 4  Helium has those two electrons, which makes the atom's outer energy level full.