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.
Solution. 1  To obtain a valence shell octet, sodium forms an ion with a 1+ charge, while the sulfur ion has a 2â charge. 2  The aluminum ion has a 3+ charge, while the fluoride ion formed by fluorine has a 1â charge. 3  Iron can form two possible ions, but the ion with a 3+ charge is specified here.