Requirements management - Overview. 1  The purpose of requirements management is to ensure that an organization documents, verifies, and meets the needs and expectations of its customers and internal or external stakeholders. Requirements management begins with the analysis and elicitation of the objectives and constraints of the organization.
The highest occupied electron shell is called the valence shell, and the electrons occupying this shell are called valence electrons. The chemical properties of the elements reflect their electron configurations. For example, helium, neon and argon are exceptionally stable and unreactive monoatomic gases.
In chemistry, an atom has a full shell if it has eight valence electrons. Atoms with full shells are stable and are essentially inert. They will not react with other atoms to form bonds. Iodine is one valence electron short of having a full shell and will readily form bonds with other atoms to fill the missing space.