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 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?

Key Concepts

Octet Rule

The octet rule states that atoms tend to bond in such a way that they have eight electrons in their valence shell. This is particularly important for second-period elements, which lack access to d-orbitals and thus cannot expand beyond an octet, limiting the number of electrons (bond pairs and lone pairs) that can be accommodated around a central atom.

Expanded Octet

Expanded octets occur in atoms that have access to d-orbitals, typically third-period elements and beyond, which allow them to accommodate more than eight electrons. This concept explains why molecules with more than eight electrons surrounding the central atom typically involve central atoms from periods beyond the second.

Bonding Pairs and Lone Pairs

Bonding pairs are pairs of electrons shared between atoms to form a covalent bond, while lone pairs are pairs of electrons localized on a single atom. The arrangement of these pairs around a central atom, as dictated by VSEPR theory, determines molecular geometry and helps identify the maximum number of electron pairs that can surround the central atom.

VSEPR Theory

Valence Shell Electron Pair Repulsion (VSEPR) theory is used to predict the geometry of molecular structures by considering the repulsions between electron pairs in the valence shell. It provides a framework for understanding how the spatial distribution of bonding and lone pairs affects the shape and electron domain count around a central atom.

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