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.
Valence electrons = the number of electrons in the outermost shell(s). They determine the chemical reactivity of an element. Atoms with a full outer shell are inert (noble gases). Atoms will transfer or share electrons to fill an incomplete shell.