Refer to Table 8.3 and answer these questions: (a) Do any...

Refer to Table $8.3$ and answer these questions:
(a) Do any molecules with more than eight valence electrons have a second-period element as the central atom?
(b) What is the maximum number of bond pairs and lone pairs that surround the central atom in any of these molecules?

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Key Concepts

Octet Rule

The octet rule dictates that atoms tend to combine in such a way that each atom has eight electrons in its valence shell, mimicking the electron configuration of a noble gas. This principle is crucial in understanding why second?period elements, which lack accessible d orbitals, strictly obey the octet rule and cannot accommodate more than eight electrons around the central atom.

Expanded Octet

Expanded octet refers to the ability of elements beyond the second period to have more than eight electrons around the central atom due to the availability of d orbitals. This concept explains why molecules with more than eight valence electrons use third-period or heavier central atoms, as these atoms can distribute additional electron pairs without violating the limitations of the octet rule.

Steric Number and VSEPR Theory

The steric number is the sum of the number of atoms bonded to a central atom plus its lone electron pairs. In Valence Shell Electron Pair Repulsion (VSEPR) theory, it determines the geometry of the molecule by predicting the arrangement of all electron pairs around the central atom. Understanding both bonded pairs and lone pairs is essential for identifying the maximum number of electron pairs that can surround a central atom in a molecule.

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