Covalent bonds form when two nonmetals share an electron. Hi Covalent bonds occur when nonmetal elements have a unstable outermost shell know as the valence electrons. The two non-metal either give up of gain electrons and then live with the other element or elements outer shell.
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Definition and Classification. Surgical site infection (SSI) is a difficult term to define accurately because it has a wide spectrum of possible clinical features. The Centers for Disease Control and Prevention (CDC) has defined SSI to standardize data collection for the National Nosocomial Infections Surveillance (NNIS) program. [8, 16] SSIs are classified into incisional SSIs, which can be superficial or deep, and organ/space SSIs, which affect the rest of the body other than the body wall layers (see the image below).