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.
For most elements, the valence shell takes eight electrons to fill. According to the octet rule, an atom is âcompleteâ when its valence shell has eight electrons; incomplete atoms share electrons and in so doing end up with full valence shells.or the carbon dioxide molecule, for example, one carbon atom bonds with two oxygen atoms. Carbon, with four electrons in its valence shell, needs four to reach the octet state. Oxygen, with six outer electrons, needs two.