A Level Chemistry OCR Practice Exam

Question: 1 / 400

What is a lone pair of electrons?

An outer-shell pair of electrons involved in bonding

An inner-shell pair of electrons with no charge

An outer-shell pair of electrons not involved in bonding

A lone pair of electrons refers to two electrons that are located in the outermost shell of an atom but are not engaged in chemical bonding with other atoms. These electrons are significant because they influence the geometry and reactivity of molecules. Lone pairs occupy space around the atom and can affect the overall structure by causing repulsion between other electron pairs, leading to various molecular shapes and angles.

In contrast, options that describe electrons involved in bonding or free to move do not accurately define what a lone pair is. Lone pairs play a crucial role in understanding molecular geometry and the behavior of compounds, making option C the correct description.

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A pair of electrons that are free to move

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