Consider the following XF₄ ions: PF₄^-, BrF₄^-, ClF₄⁺, and AlF₄^-. (a) Which of the ions have more than an octet of electrons around the central atom?

검증된 단계별 안내

Determine the number of valence electrons for each central atom: P, Br, Cl, and Al.

Add or subtract electrons based on the charge of the ion: add one electron for negative charges and subtract one for positive charges.

Calculate the total number of electrons around the central atom by adding the electrons from the fluorine atoms (each F contributes one electron to the central atom).

Check if the total number of electrons around the central atom exceeds 8, which would indicate more than an octet.

Identify which ions have central atoms with more than 8 electrons, indicating an expanded octet.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

16m

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Octet Rule

The octet rule is a chemical principle that states atoms tend to bond in such a way that they have eight electrons in their valence shell, achieving a stable electron configuration similar to that of noble gases. This rule is particularly relevant for main group elements, which typically form bonds to fulfill this requirement. However, some elements, especially those in the third period and beyond, can expand their octet due to available d-orbitals.

Expanded Octet

An expanded octet occurs when an atom has more than eight electrons in its valence shell. This phenomenon is common in elements from the third period of the periodic table and beyond, such as phosphorus, sulfur, and chlorine, which can utilize their d-orbitals to accommodate additional electrons. Understanding which elements can expand their octet is crucial for predicting the bonding and structure of certain molecules and ions.

Lewis Structures

Lewis structures are diagrams that represent the bonding between atoms in a molecule and the lone pairs of electrons that may exist. They are essential for visualizing the arrangement of electrons and determining whether an atom has achieved an octet or an expanded octet. By drawing Lewis structures for the given ions, one can easily identify the number of electrons surrounding the central atom and assess compliance with the octet rule.

Consider the following XF4 ions: PF4-, BrF4-, ClF4+, and AlF4-. (a) Which of the ions have more than an octet of electrons around the central atom?