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.
â¢ Valence electrons are participating in the chemical bond formation, but core electrons are not. â¢ Valence electrons are residing in the outer most shells (in the main group elements) whereas core electrons reside in inner shells. â¢ The energy that should be supplied to remove core electrons is higher than that of valence electrons.